An Investment of $20,000 Offers a Return of $15,000 in 10

An investment of $20,000 offers a return of $15,000 in 10 years and another return of $15,000 after 15 years. The market rate of interest is 6 percent per year.
-Refer to the scenario above. What is the sum of the present values of the returns from this investment?

A) $12,887.64
B) $14,634.90
C) $19,524.69
D) $29,524.19