An investment project has annual cash inflows of $4,200, $5,300, $6,100, and $7,400, and a discount rate of 14 percent. Required: (a) What is the discounted payback period for these cash flows if the initial cost is $7,000? (Do not round your intermediate calculations.) (b) What is the discounted payback period for these cash flows if the initial cost is $10,000? (Do not round your intermediate calculations.) (c) What is the discounted payback period for these cash flows if the initial cost is $13,000? (Do not round your intermediate calculations.)