$4$Calculating Discounted Payback $($LO$3)$ An investment project has annual cash inflows of $$4,200,$ $$5,300,$ $$6,100,$ and $$7,400,$ and a discount rate of $14\%.$ What is the discounted payback period for these cash flows if the initial cost is $$7,000?$ What if the initial cost is $$10,000?$ What if it is $$13,000?$