Calculating Discounted Payback [1.03] An investment project has annual cash inflows of $2,800,$3,700,$5,100, and $4,300. for the next four years, respectively. The discount rate is 9 percent. What is the discounted payback period for these cash flows if the initial cost is $5,200 ? What if the intial cost is $6,400 ? What if it is $10,400