An investment project provides cash inflows of $$1,400$ per year for eight years.

a$.$ What is the project payback period if the initial cost is $$4,350?($Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ What is the project payback period if the initial cost is $$5,400?($Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

c$.$ What is the project payback period if the initial cost is $$12,200?($Enter $0$ if the project never pays back. Do not round intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$