Answer:
B. $6,448,519
Step-by-step explanation:
The computation of the present value of this growing annuity is given below:
PVA = [Cash flow at year 1 ÷ (interest rate - growth rate)] × {1 - [(1 + growth rate) ÷ (1 + interest rate)^number of years}
= [$675,000 ÷ (0.18 - 0.13)] × [1 - (1.13 ÷ 1.18)^15]
= $6,448,519
Hence, the correct option is b.