please solve by hand

A company is considering reconfiguring an existing production line to produce respirator masks for healthcare professionals. To accelerate such development, the company has negotiated a total governmental grant of $100,000 received on two transactions; a receipt of $50,000 at the beginning and as well as at the end of the first year. Only 50% of the total grant is payable back with an annual interest rate of 1.25% at the end of the third year. There are two alternatives (configurations) to create the mask production line. The company's real Minimum Attractive Rate of Return (MARR) is 9%. Average annual inflation rate is 1.50%. The properties of these investments are provided in the following table (all dollar values are estimated in today's dollars): Configuration 1 Configuration 2 Initial Cost $180,000 $255,000 Annual Maintenance $15,000/year $22,000/year cost Annual Sales 45,000 units/year 52,000 units/year Production unit cost $1.5/unit $1.0/unit Product unit sale price $3.25/unit Salvage value after 5$60,000 $3.25/unit $70,000 years CCA Rate 30% 30% Service life 3 years 3 years For both alternatives, answer the following questions considering applicable taxes whenever possible: [a] Calculate the NPW of both alternatives taking into account all taxes at a tax rate of 38% (i.e., for after-tax cash flow). Half-year rule applies. [b] Which alternative is economically better