Use these present value tables to answer the question that follow. Below is a table for the present value of $1 at compound interest.

Year6%10%12%10.9430.9090.89320.8900.8260.79730.8400.7510.71240.7920.6830.63650.7470.6210.567

Below is a table for the present value of an annuity of $1 at compound interest.

Year6%10%12%10.9430.9090.89321.8331.7361.69032.6732.4872.40243.4653.1703.03754.2123.7913.605

Using the tables above, what would be the internal rate of return of an investment of $227,460 that would generate an annual cash inflow of $60,000 for the next five years?

a. 12%

b. 10%

c. 6%

d. Cannot be determined from the data given.