(IRR calculation) Determine the IRR on the following projects: a. An initial outlay of $12,000 resulting in a single free cash flow of $16,709 after 6 years b. An initial outlay of $12,000 resulting in a single free cash flow of $54,425 after 13 years c. An initial outlay of $12,000 resulting in a single free cash flow of $111,206 after 21 years d. An initial outlay of $12,000 resulting in a single free cash flow of $13,611 after 3 years