An investment project provides cash inflows of $645 per year for eight years.

What is the project payback period if the initial cost is $1,800? (Enter 0 if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.)

Payback period in years ?   

What is the project payback period if the initial cost is $3,500? (Enter 0 if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.)

Payback period in years ?

What is the project payback period if the initial cost is $5,300? (Enter 0 if the project never pays back. Round your answer to 2 decimal places, e.g., 32.16.)

Payback period in years ?