# Fight Finance

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Katya offers to pay you $10 at the end of every year for the next 5 years (t=1,2,3,4,5) if you pay her$50 now (t=0). You can borrow and lend from the bank at an interest rate of 10% pa, given as an effective annual rate. Ignore credit risk.

Will you or politely Katya's deal?

Your friend wants to borrow $1,000 and offers to pay you back$100 in 6 months, with more $100 payments at the end of every month for another 11 months. So there will be twelve$100 payments in total. She says that 12 payments of $100 equals$1,200 so she's being generous.

If interest rates are 12% pa, given as an APR compounding monthly, what is the Net Present Value (NPV) of your friend's deal?

A project to build a toll bridge will take two years to complete, costing three payments of $100 million at the start of each year for the next three years, that is at t=0, 1 and 2. After completion, the toll bridge will yield a constant$50 million at the end of each year for the next 10 years. So the first payment will be at t=3 and the last at t=12. After the last payment at t=12, the bridge will be given to the government.

The required return of the project is 21% pa given as an effective annual nominal rate.

All cash flows are real and the expected inflation rate is 10% pa given as an effective annual rate. Ignore taxes.

The Net Present Value is:

The following cash flows are expected:

• 10 yearly payments of $60, with the first payment in 3 years from now (first payment at t=3 and last at t=12). • 1 payment of$400 in 5 years and 6 months (t=5.5) from now.

What is the NPV of the cash flows if the discount rate is 10% given as an effective annual rate?

The following cash flows are expected:

• 10 yearly payments of $80, with the first payment in 3 years from now (first payment at t=3). • 1 payment of$600 in 5 years and 6 months (t=5.5) from now.

What is the NPV of the cash flows if the discount rate is 10% given as an effective annual rate?

On his 20th birthday, a man makes a resolution. He will deposit $30 into a bank account at the end of every month starting from now, which is the start of the month. So the first payment will be in one month. He will write in his will that when he dies the money in the account should be given to charity. The bank account pays interest at 6% pa compounding monthly, which is not expected to change. If the man lives for another 60 years, how much money will be in the bank account if he dies just after making his last (720th) payment? There are many ways to write the ordinary annuity formula. Which of the following is NOT equal to the ordinary annuity formula? Your friend overheard that you need some cash and asks if you would like to borrow some money. She can lend you$5,000 now (t=0), and in return she wants you to pay her back $1,000 in two years (t=2) and every year after that for the next 5 years, so there will be 6 payments of$1,000 from t=2 to t=7 inclusive.

What is the net present value (NPV) of borrowing from your friend?

Assume that banks loan funds at interest rates of 10% pa, given as an effective annual rate.

This annuity formula $\dfrac{C_1}{r}\left(1-\dfrac{1}{(1+r)^3} \right)$ is equivalent to which of the following formulas? Note the 3.

In the below formulas, $C_t$ is a cash flow at time t. All of the cash flows are equal, but paid at different times.

A business project is expected to cost $100 now (t=0), then pay$10 at the end of the third (t=3), fourth, fifth and sixth years, and then grow by 5% pa every year forever. So the cash flow will be $10.5 at the end of the seventh year (t=7), then$11.025 at the end of the eighth year (t=8) and so on perpetually. The total required return is 10℅ pa.

Which of the following formulas will NOT give the correct net present value of the project?

Some countries' interest rates are so low that they're zero.

If interest rates are 0% pa and are expected to stay at that level for the foreseeable future, what is the most that you would be prepared to pay a bank now if it offered to pay you $10 at the end of every year for the next 5 years? In other words, what is the present value of five$10 payments at time 1, 2, 3, 4 and 5 if interest rates are 0% pa?

The following cash flows are expected:

• 10 yearly payments of $80, with the first payment in 6.5 years from now (first payment at t=6.5). • A single payment of$500 in 4 years and 3 months (t=4.25) from now.

What is the NPV of the cash flows if the discount rate is 10% given as an effective annual rate?

You are promised 20 payments of $100, where the first payment is immediate (t=0) and the last is at the end of the 19th year (t=19). The effective annual discount rate is $r$. Which of the following equations does NOT give the correct present value of these 20 payments? Telsa Motors advertises that its Model S electric car saves$570 per month in fuel costs. Assume that Tesla cars last for 10 years, fuel and electricity costs remain the same, and savings are made at the end of each month with the first saving of $570 in one month from now. The effective annual interest rate is 15.8%, and the effective monthly interest rate is 1.23%. What is the present value of the savings? The present value of an annuity of 3 annual payments of$5,000 in arrears (at the end of each year) is $12,434.26 when interest rates are 10% pa compounding annually. If the same amount of$12,434.26 is put in the bank at the same interest rate of 10% pa compounded annually and the same cash flow of $5,000 is withdrawn at the end of every year, how much money will be in the bank in 3 years, just after that third$5,000 payment is withdrawn?

It's the first day of the year and you currently have $4,500 in the bank. You plan to deposit$200 at the end of every year for the next 57 years, with the first payment made 1 year from now (from t=1 to t=57 inclusive).

If bank interest rates are 8% pa, how much money will be in your bank account a moment after making your last deposit in 57 years?

Find the present value of 30 annual payments of $4,000 per annum where the first payment is made 11 years from now. So there are 30 annual payments from t=11 to t=40 inclusive. The discount rate is 7% pa. The present value of these payments is: Find the net present value (NPV) of a mining project with the following cash flows: • -$3,000 at time zero (t=0). This is the initial cost to prepare and build the mine and facilities. This cost is all paid upfront, though the builders will take 4 years to finish construction.
• $650 paid annually 45 times, where the first payment is made 5 years from now. So there are 45 annual payments from t=5 to t=49 inclusive. These are the positive cash flows from running the mine once it's built. • -$1,400 at t=49. This is the clean-up cost of burying the mine and replanting native vegetation at the end of the project. This cost is paid at the same time as the last positive cash flow is received from running the mine.

The required return is 15% pa. All dollar figures above and below are in millions. The NPV of this project is: