An investment project has annual cash inflows of $$4,700,$ $$3,600,$ $$4,800,$ and $$4,000,$ for the next four years, respectively. The discount rate is $14$ percent.

a$.$

What is the discounted payback period for these cash flows if the initial cost is $$5,400?($Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ What is the discounted payback period for these cash flows if the initial cost is $$7,500?($Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

c$.$ What is the discounted payback period for these cash flows if the initial cost is $$10,500?$