An investment project provides cash inflows of $$950$ per year for eight years.

a$.$ What is the project payback period if the initial cost is $$3,450?$

Note: Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

b$.$ What is the project payback period if the initial cost is $$4,500?$

Note: Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

c$.$ What is the project payback period if the initial cost is $$8,600?$

Note: Enter $0$ if the project never pays back. Do not round intermediate calculations and round your answe places, e$.$g$.,32\mathrm{.}16.$