An investment project costs $15,400 and has annual cash flows of $3,100 for six years. a. What is the discounted payback period if the discount rate is zero percent? b. What is the discounted payback period if the discount rate is 4 percent? b. What is the discounted payback period if the discount rate is 4 percent? w c. What is the discounted payback period if the discount rate is 19 percent