A machine that costs $8,000 is expected to operate for 10 years. The estimated salvage value at the end of 10 years is $0. The machine is expected to save the company $1,554 per year before taxes and depreciation. The company depreciates its assets on a straight-line basis and has a marginal tax rate of 35 percent. What is the internal rate of return on this investment? Answer a. 14.34% b. 9.79% c. 12.98% d. 9.11%