no excel please.

Consider the following cash flows: Period 1 Cash Flow 5,000 2 3,000 3 2,000 4 4,000 a) If the interest rate is 9%, what is the present value of the cash flow stream if the cash flows occur at the end of the period? (Show your work) (2 marks) b) If the interest rate is 9%, what is the present value of the cash flow stream if the cash flows occur at the beginning of the period? (Show your work) (2 marks) c) If the interest rate is 9%, what is the future value of the cash flow stream if the cash flows occur at the end of the period? (2 marks) d) If the interest rate is 9%, what is the future value of the cash flow stream if the cash flows occur at the beginning of the period? (2 marks) D70cl