Krzys' Ostaszewski, http://www.math.ilstu.edu/krzysio/, Exercise 169

```Krzys’ Ostaszewski, http://www.math.ilstu.edu/krzysio/, Exercise 169, 8/9/8
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Study Note FM-09-05, Problem No. 50
A 1000 bond with semi-annual coupons at i ( 2 ) = 6% matures at par on October 15, 2020.
The bond is purchased on June 28, 2005 to yield the investor i ( 2 ) = 7%. What is the
purchase price? Assume simple interest between bond coupon dates, and the following
day count:
Date
Day of the Year
April 15
105
June 28
179
October 15
288
A. 906
B. 907
C. 908
D. 919
E. 925
Solution.
We start by finding the price of the bond on the previous coupon date: April 15, 2005. On
that date, there are 31 coupons of \$30 each left and the price is:
31
30 ⋅ a31 3.5% + 1000v3.5%
≈ 906.32.
Therefore, the price on June 28 is (note the use of simple interest for interim
accumulation)
74
⎛ 179 − 105
⎞
⎛
⎞
906.32 ⋅ ⎜ 1 +
⋅ 0.035 ⎟ = 906.32 ⋅ ⎜ 1 +
⋅ 0.035 ⎟ ≈ 919.18.
⎝
⎠
⎝ 182.5
⎠
182.5
This is a form of the flat price, not market price, and the reason why we use the flat price
is that the question asks for the purchase price.