answer without using excel please

Replacement Decisions A university student painter is considering the purchase of a new air compressor and paint gun to replace an old paint sprayer. (Both items belong to class 8 for CCA purposes.) These two new items cost $7,000 and have a useful life of three years, at which time they can be sold for $600. The old paint sprayer can be sold now for $200 and could be scrapped for $150 in three years. The entrepreneurial student believes that operating revenues will increase annually by $6,000. Should the purchase be made? The tax rate is 22 percent and the required rate of return is 18 percent