QUESTION 21 Gamma Electronics Gamma Electronics is considering the purchase of testing equipment that will cost $500,000 to replace old equipment. Assume the new machine will generate after-tax savings of $250,000 per year over the next four years. Refer to Gamma Electronics. What's the payback period for the investment? A. 1.8 years B. 2.0 years C. 2.5 years D.2.8 years