5. A firm has invested $50,000 in equipment with a 5-year useful life. The machinery will have a salvage value of $5,000. The annual benefits from the machinery are $13,000 for the first year and increase by $2,000 per year. Assume a combined 30% income tax rate, and the firm uses the SOYD depreciation. (a) (10 pts) Calculate the before-tax IRR. O 16.7%/year 18.9%/year 0 20.6%/year 21.8%/year (b) (10 pts) Calculate the after-tax IRR. O 11.9%/year 13.3%/year O 14.2%/year O 15.2%/year