can someone please solve asap? these two are part of the same question! thank you!!

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? An investment project costs $12,700 and has annual cash flows of $3,000 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