Without using excel!!

Problem (7): Two manufacturers offered the estimate below: Offer A Offer B 13,800 3,600 17,600 3,350 First Cost, $ Annual M&O cost, $ per year Salvage Value, $ (10% residual value) Life, Years 1,400 7 1,800 10 a. Which Offer should be selected using PW analysis, if MARR is 15%? b. If a 5-year study period is adopted and the residual values are expected to be 20% and 50% of the machine's value, for vendors A and B respectively. Which Offer should be selected? C. A 10-year study period is adopted. For Offer A, the company is considering renting for the remaining of the required study period. What annual rate would make both offers economically equivalent? Problem (7): Two manufacturers offered the estimate below: Offer A Offer B 13,800 3,600 17,600 3,350 First Cost, $ Annual M&O cost, $ per year Salvage Value, $ (10% residual value) Life, Years 1,400 7 1,800 10 a. Which Offer should be selected using PW analysis, if MARR is 15%? b. If a 5-year study period is adopted and the residual values are expected to be 20% and 50% of the machine's value, for vendors A and B respectively. Which Offer should be selected? C. A 10-year study period is adopted. For Offer A, the company is considering renting for the remaining of the required study period. What annual rate would make both offers economically equivalent