Answer:
$75,881.59
Explanation:
The value of the fund on the child's 17th birthday can be found from the amortization formula using r=.08 and t=7.
17000 = Pr/(1 -(1+r)^-t) = P(.08)/(1 -1.08^-7) = 0.1920724P
P = 17000/0.1920724 ≈ 88,508.29
There are 2 years between the 15th birthday and the 17th birthday, so the initial fund earns 8% interest for that time. It is multiplied by 1.08^2 to get the above value. The initial fund is then ...
88,508.29 = 1.08^2 × initial fund
initial fund = 88,508.29/1.08^2 ≈ 75,881.59
The amount of $75,881.59 must be used to purchase the annuity required to fund the payments to the niece.