On 22-Mar-2013 the Australian Government issued series TB139 treasury bonds with a combined face value $23.4m, listed on the ASX with ticker code GSBG25.

The bonds mature on **21-Apr-2025**, the fixed coupon rate is **3.25**% pa and coupons are paid **semi-annually** on the 21st of April and October of each year. Each bond's face value is $**1,000**.

At market close on Friday **11-Sep-2015** the bonds' yield was **2.736**% pa.

At market close on Monday **14-Sep-2015** the bonds' yield was **2.701**% pa. Both yields are given as annualised percentage rates (APR's) compounding every 6 months. For convenience, assume 183 days in 6 months and 366 days in a year.

What was the historical total return over those 3 calendar days between Friday 11-Sep-2015 and Monday 14-Sep-2015?

There are **183** calendar days from market close on the last coupon 21-Apr-2015 to the market close of the next coupon date on 21-Oct-2015.

Between the market close times from 21-Apr-2015 to 11-Sep-2015 there are **143** calendar days. From 21-Apr-2015 to 14-Sep-2015 there are **146** calendar days.

From 14-Sep-2015 there were **20** coupons remaining to be paid including the next one on 21-Oct-2015.

All of the below answers are given as effective 3 day rates.