**Question 793** option, hedging, delta hedging, gamma hedging, gamma, Black-Scholes-Merton option pricing

A bank buys **1000** European put options on a $10 non-dividend paying stock at a strike of $12. The bank wishes to hedge this exposure. The bank can trade the underlying stocks and European call options with a strike price of 7 on the same stock with the same maturity. Details of the call and put options are given in the table below. Each call and put option is on a single stock.

European Options on a Non-dividend Paying Stock |
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Description |
Symbol |
Put Values |
Call Values |

Spot price ($) | ##S_0## | 10 | 10 |

Strike price ($) | ##K_T## | 12 |
7 |

Risk free cont. comp. rate (pa) | ##r## | 0.05 | 0.05 |

Standard deviation of the stock's cont. comp. returns (pa) | ##\sigma## | 0.4 | 0.4 |

Option maturity (years) | ##T## | 1 | 1 |

Option price ($) | ##p_0## or ##c_0## | 2.495350486 | 3.601466138 |

##N[d_1]## | ##\partial c/\partial S## | 0.888138405 | |

##N[d_2]## | ##N[d_2]## | 0.792946442 | |

##-N[-d_1]## | ##\partial p/\partial S## | -0.552034778 | |

##N[-d_2]## | ##N[-d_2]## | 0.207053558 | |

Gamma | ##\Gamma = \partial^2 c/\partial S^2## or ##\partial^2 p/\partial S^2## | 0.098885989 | 0.047577422 |

Theta | ##\Theta = \partial c/\partial T## or ##\partial p/\partial T## | 0.348152078 | 0.672379961 |

Which of the following statements is **NOT** correct?

**Question 794** option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the **Delta** of a European **call** option?

Where:

###d_1=\dfrac{\ln[S_0/K]+(r+\sigma^2/2).T)}{\sigma.\sqrt{T}}### ###d_2=d_1-\sigma.\sqrt{T}=\dfrac{\ln[S_0/K]+(r-\sigma^2/2).T)}{\sigma.\sqrt{T}}###**Question 795** option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the **Delta** of a European **put** option?

**Question 796** option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the risk-neutral **probability** that a European **call** option will be exercised?

**Question 797** option, Black-Scholes-Merton option pricing, option delta, no explanation

Which of the following quantities from the Black-Scholes-Merton option pricing formula gives the risk-neutral **probability** that a European **put** option will be exercised?

A **12** month European-style **call** option with a strike price of $**11** is written on a dividend paying stock currently trading at $**10**. The dividend is paid annually and the next dividend is expected to be $**0.40**, paid in **9** months. The risk-free interest rate is **5**% pa continuously compounded and the standard deviation of the stock’s continuously compounded returns is **30** percentage points pa. The stock's continuously compounded returns are normally distributed. Using the Black-Scholes-Merton option valuation model, determine which of the following statements is **NOT** correct.

**Question 834** option, delta, theta, gamma, standard deviation, Black-Scholes-Merton option pricing

Which of the following statements about an option (either a call or put) and its underlying stock is **NOT** correct?

European Call Option |
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on a non-dividend paying stock | ||

Description |
Symbol |
Quantity |

Spot price ($) | ##S_0## | 20 |

Strike price ($) | ##K_T## | 18 |

Risk free cont. comp. rate (pa) | ##r## | 0.05 |

Standard deviation of the stock's cont. comp. returns (pa) | ##\sigma## | 0.3 |

Option maturity (years) | ##T## | 1 |

Call option price ($) | ##c_0## | 3.939488 |

Delta | ##\Delta = N[d_1]## | 0.747891 |

##N[d_2]## | ##N[d_2]## | 0.643514 |

Gamma | ##\Gamma## | 0.053199 |

Theta ($/year) | ##\Theta = \partial c / \partial T## | 1.566433 |

A **one** year European-style **call** option has a strike price of $**4**.

The option's underlying stock currently trades at $**5**, pays no dividends and its standard deviation of continuously compounded returns is **47**% pa.

The risk-free interest rate is **10**% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The call option price now is:

A **one** year European-style **put** option has a strike price of $**4**.

The option's underlying stock currently trades at $**5**, pays no dividends and its standard deviation of continuously compounded returns is **47**% pa.

The risk-free interest rate is **10**% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The put option price now is:

**Question 903** option, Black-Scholes-Merton option pricing, option on stock index

A **six** month European-style **call** option on the S&P500 stock index has a strike price of **2800** points.

The underlying S&P500 stock index currently trades at **2700** points, has a continuously compounded dividend yield of **2**% pa and a standard deviation of continuously compounded returns of **25**% pa.

The risk-free interest rate is **5**% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The call option price now is:

**Question 904** option, Black-Scholes-Merton option pricing, option on future on stock index

A **six** month European-style **call** option on six month S&P500 index **futures** has a strike price of **2800** points.

The six month **futures** price on the S&P500 index is currently at **2740.805274** points. The futures underlie the call option.

The S&P500 stock index currently trades at **2700** points. The stock index underlies the futures. The stock index's standard deviation of continuously compounded returns is **25**% pa.

The risk-free interest rate is **5**% pa continuously compounded.

Use the Black-Scholes-Merton formula to calculate the option price. The call option price now is:

**Question 956** option, Black-Scholes-Merton option pricing, delta hedging, hedging

A bank sells a European call option on a non-dividend paying stock and delta hedges on a daily basis. Below is the result of their hedging, with columns representing consecutive days. Assume that there are 365 days per year and interest is paid daily in arrears.

Delta Hedging a Short Call using Stocks and Debt |
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Description |
Symbol |
Days to maturity (T in days) |
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60 |
59 |
58 |
57 |
56 |
55 |
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Spot price ($) | S | 10000 | 10125 | 9800 | 9675 | 10000 | 10000 |

Strike price ($) | K | 10000 | 10000 | 10000 | 10000 | 10000 | 10000 |

Risk free cont. comp. rate (pa) | r | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 | 0.05 |

Standard deviation of the stock's cont. comp. returns (pa) | σ | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |

Option maturity (years) | T | 0.164384 | 0.161644 | 0.158904 | 0.156164 | 0.153425 | 0.150685 |

Delta | N[d1] = dc/dS | 0.552416 | 0.582351 | 0.501138 | 0.467885 | 0.550649 | 0.550197 |

Probability that S > K at maturity in risk neutral world | N[d2] | 0.487871 | 0.51878 | 0.437781 | 0.405685 | 0.488282 | 0.488387 |

Call option price ($) | c | 685.391158 | 750.26411 | 567.990995 | 501.487157 | 660.982878 | ? |

Stock investment value ($) | N[d1]*S | 5524.164129 | 5896.301781 | 4911.152036 | 4526.788065 | 5506.488143 | ? |

Borrowing which partly funds stock investment ($) | N[d2]*K/e^(r*T) | 4838.772971 | 5146.037671 | 4343.161041 | 4025.300909 | 4845.505265 | ? |

Interest expense from borrowing paid in arrears ($) | r*N[d2]*K/e^(r*T) | 0.662891 | 0.704985 | 0.594994 | 0.551449 | ? | |

Gain on stock ($) | N[d1]*(SNew - SOld) | 69.052052 | -189.264008 | -62.642245 | 152.062648 | ? | |

Gain on short call option ($) | -1*(cNew - cOld) | -64.872952 | 182.273114 | 66.503839 | -159.495721 | ? | |

Net gain ($) | Gains - InterestExpense | 3.516209 | -7.695878 | 3.266599 | -7.984522 | ? | |

Gamma | Γ = d^2c/dS^2 | 0.000244 | 0.00024 | 0.000255 | 0.00026 | 0.000253 | 0.000255 |

Theta | θ = dc/dT | 2196.873429 | 2227.881353 | 2182.174706 | 2151.539751 | 2266.589184 | 2285.1895 |

In the last column when there are 55 days left to maturity there are missing values. Which of the following statements about those missing values is **NOT** correct?

**Question 1003** Black-Scholes-Merton option pricing, log-normal distribution, return distribution, hedge fund, risk, financial distress

A hedge fund issued zero coupon bonds with a combined $**1** billion **face** value due to be paid in **3** years. The promised yield to maturity is currently **6**% pa given as a continuously compounded return (or log gross discrete return, ##LGDR=\ln[P_T/P_0] \div T##).

The hedge fund owns stock assets worth $**1.1** billion now which are expected to have a **10**% pa arithmetic average log gross discrete return ##(\text{AALGDR} = \sum\limits_{t=1}^T{\left( \ln[P_t/P_{t-1}] \right)} \div T)## and **30**pp pa standard deviation (SDLGDR) in the future.

Analyse the hedge fund using the Merton model of corporate equity as an option on the firm's assets.

The risk free government bond yield to maturity is currently **5**% pa given as a continuously compounded return or LGDR.

Which of the below statements is **NOT** correct? All figures are rounded to the sixth decimal place.