3. Use Future Worth to analyze the follow choice among welding robot models. The planning horizon is 7 years. The annual interest rate is 6%. All calculations are before taxes. Show all intermediate calculations. Model A. Initial Cost 100,000 Operating cost per year is 10,000, maintenance cost first year 500, Each year the maintenance cost increases by 1000. The salvage value will be 12,000. Expected equivalent revenue is 40,000 annual. Model B. Initial Cost 200,000. Operating cost per year 8000. maintenance cost uniform (covered by a yearly contract) of 2500 per year. Salvage value is 80,000. Expected equivalent revenue is 55,000. Model C. Initial cost 80,000. Yearly operating cost 3,000. Maintenance cost was small (covered by normal factor maintenance except for year 4 where there was a 12,000 event and year 6 where there was a 9,000 event. Salvage value 25.000. Equivalent yearly revenue is 40,000