Answer without excel; the answer is included at the bottom using excel but I want to know how to do it without

Review Problems 1. Determine whether the following contract described below is worthwhile of undertaking after taxes if at the end of the 2-year of ownership the contract, you expect to sell both depreciable equipment. Use present worth analysis under MARR =15% and effective tax rate. - The MARCS depreciation percentages (GDS 10) for each year are as follows: 10.00;18.00;14.40;11.52;9.22;7.37;6.55;6.55;6.56;6.55; and 3.28 . Review Problems 1. Determine whether the following contract described below is worthwhile of undertaking after taxes if at the end of the 2-year of ownership the contract, you expect to sell both depreciable equipment. Use present worth analysis under MARR =15% and effective tax rate. - The MARCS depreciation percentages (GDS 10) for each year are as follows: 10.00;18.00;14.40;11.52;9.22;7.37;6.55;6.55;6.56;6.55; and 3.28