please help with a - d

(IRR calculation) Determine the /RR on the following projects: a. An initial outlay of $12,000 resulting in a single free cash flow of $17,093 after 7 years b. An initial outlay of $12,000 resulting in a single free cash flow of $53,805 after 15 years c. An initial outlay of $12,000 resulting in a single free cash flow of $105,505 after 22 years d. An initial outlay of $12,000 resulting in a single free cash flow of $13,943 after 5 years