An investment project costs $15,000 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? Discounted payback period 4.84 b. What is the discounted payback period if the discount rate is 6 percent? Discounted payback period c. What is the discounted payback period if the discount rate is 22 percent?

I just need part B and C please help!!!! Its timed.

An investment project costs $15,000 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 6 percent? c. What is the discounted payback period if the discount rate is 22 percent