An investment project costs $15,900 and has annual cash flows of $4,100 for six years. Required: (a) What is the discounted payback period if the discount rate is zero percent? (Click to select) (b) What is the discounted payback period if the discount rate is 4 percent? (Click to select) (c) What is the discounted payback period if the discount rate is 21 percent? (Click to select)