4. A piece of equipment is bought for $100,000, has a salvage value of $20,000 in 5 years, and the equipment brings in before-tax revenue of $30,000 per year over the 5 years. (a) (5 pts.) Using double-declining balance, calculate the depreciation allowance (DWO) for the equipment in the first 2 years of depreciation. (b) (10 pts.) Calculate the taxable income, income tax, and the after-tax cash flow for years 1 and 2. Assume an income tax rate of 0.4