Present values: For each of the cases shown in the following table, calculate the present value of the cash flow, discounting at the rate given and assuming that the cash flow is received at the end of the period noted

Case Single Cash Flow Discount Rate End of period (years)

A $ 7,000 12% 4

B 28,000 8% 20

C 10,000 14% 12

D 150,000 11% 6

E 45,000 20 8

I'm looking for help with the answer in good written form. Having the formula next to it would help.