A plastics company is considering two injection molding processes. Process X will have a first cost of $600,000, annual costs of $200,000, and a salvage value of $100,000 after 5 years. Process Y will have a first cost of $800,000, annual costs of $150,000, and a salvage value of $230,000 after 5 years. (a) What is the rate of return on the increment of investment between the two? (b) Which process should the company select on the basis of a rate of return analysis, if the MARR is 20% per year?