A hem has invested $30000 in equipment with a 5-year useful life. The machinery will have no salvage value. The annual benefits from the machinery are $7000 for the first year and increase by $1000 per year. Assume a combined 40% marginal income tax rate, and straight line depreciation (a) (10 points) Compute the before-tax in. 12/ 134/ 14/ 10 DES (b) (10 pts) Compute the after-taxi O 12K/YCH 11/year 10/year 9%/year (c) (10 points) If the firm's MARR is 9%/year, compute the after-tax present worth (PW). O $843 -$62 $126 -$599