What is the present value of five $800 cash flows that occur at the end of each year for the next five years at a periodic interest rate of 8% compounded annually? The first cash flow occurs a year...

What is the present value of five $800 cash flows that occur at the end of each year for the next five years at a periodic interest rate of 8% compounded annually? The first cash flow occurs a year from now, the second cash flow occurs two years from now, . . . , and the fifth cash flow occurs five years from now.

What is the present value of twenty $500 cash flows that occur at the end of each year for the next twenty years at a periodic interest rate of 7.5% compounded annually? The first cash flow occurs a year from now, the second cash flow occurs two years from now, . . . , and the twentieth cash flow occurs twenty years from now.