(Related to Checkpoint 11.1 on page 335) (IRR calculation)

what are the internal rates of return for the following projects?

a. An initial outlay of $10,000 resulting in a single cash inflow of $17,182 in 8 years

b. An initial outlay of $10,000 resulting in a single cash inflow of $48,077 in 10 years

c. An initial outlay of $10,000 resulting in a single cash inflow of $115,231 in 20 years

d. An initial outlay of $10,000 resulting in a single cash inflow of $13,680 in 3 years