oblem 8 rm has the following investment alternatives: Year $--- 1 Cash Inflows B $--- 400 800 800 $400 400 400 400 2 3 4 1,800 Each investment costs $1,400, and the firm's cost of capital is 1 a. What is each investment's internal rate of return? b. Should the firm make any of these investments ? c. What is each investment's net present value? d. Should the firm make any of these investments