Suppose you wish to have $18500 in 5 years. use the present value formula to find out how much you should invest now at 9% interest, compounded semiannually, in order to have $18,500, 5 years from...

Suppose you wish to have $18500 in 5 years. use the present value formula to find out how much you should invest now at 9% interest, compounded semiannually, in order to have $18,500, 5 years from now. Then calculate the interest.

The possible answers are:

a. 6587.34

b. 8325.00

c. 10175.00

d. 11912.66

I understand how to do the present value formula but after that I don't understand how to calculate the interest, please help!