Apex Corporation requires a chemical finishing process for a product under contract for a period of six years. Three options are available. Neither Option 1 nor Option 2 can be repeated after its process life. However, Option 3 will always be available from H&H Chemical Corporation at the same cost during the period that the contract is operative. Here are the options: Option 1: Process device A, which costs S 100,000, has annual operating and labor costs of $60,000 and a useful service life of four years with an estimated salvage value of $10,000. Option 2: Process device B, which costs $150,000, has annual operating, labor costs of $50,000 and a useful service life of six years with an estimated salvage value of $30,000. Option 3: Subcontract out the process at a cost of $100,000 per year. a) According to the present-worth criterion, which option would you recommend at i = 12%? b) If the required service period is changed to 5 years, what would be the best course of action? c) If there are price differentials in the subcontracting option (say, $55,000 a year for a 6-year contract, $60,000 for a 5-year contract, $70,000 a year for a 4-year contract and 575,000 a year for any contract lasting less than 4 years), what would be the best option? d) If both processes A and B would be available in the subsequent years, but the required investment and salvage value would be increasing at the annual rate of 10%, what would be the best course of action? e) If both processes A and B will be available in the subsequent years, but the required investment and salvage value (as well as the O & M costs) would be decreasing at the annual rate of 10%, what would be the best course of action