A company purchase a piece of manufacturing equipment for an additional income. The expected income is $3,500 per semester. Its useful life is 9 years. Expenses are estimated to be $500 semiannually. If the purchase price is $44,000 and there is a salvage value of $4,500, what is the prospective rate of return (IRR) of this investment? The MARR is 10% compounded semiannually.

a. IRR = 3% semiannual

b. IRR = 12% semiannual

c. IRR = 6% semiannual

d. IRR = 6.02% semiannual