not in excel

I need simple formula with all the process

11-6. (Calculating IRR) (Related to Checkpoint 11.1 on page 367) What are the IRRs for the following projects? a. An initial outlay of 5,000 resulting in a single cash inflow of 9,962 in 8 years b. An initial outlay of 5,000 resulting in a single cash inflow of 12,968 in 10 years c. An initial outlay of 5,000 resulting in a single cash inflow of 48,231 in 20 years d. An initial outlay of 5,000 resulting in a single cash inflow of 5,995 in 3 years