need solution without excel formula

8. Assume a $90,000 investment and the following cash flows for two alternatives: Investment Investment A B Year 1 $25,000 $40,000 2 30,000 40,000 28,000 3 25,000 4 19,000 5 25,000 a. b. Calculate the payback for Investments A and B. If the inflow in the fifth year for Investment A was $25,000,000 instead of $25,000, would your answer change under the payback method? page 409