4a1)Peter is considering the purchase of one of two machines used in his industrial plant. Machine PP has a life of two years, costs $52 initially, and then $60 per year in maintenance costs. Machine QQ has a life of three years, costs $82 initially, and requires $50 in annual maintenance costs. Either machine must be replaced at the end of its life. Which is the better machine for the firm? Explain. The discount rate is 12% and the tax rate is zero.