Question 12 You are considering the purchase of one of two machines used in initially, and then $150 per year in maintenance costs. Machine maintenance costs. Either machine must be replaced at the end firm? The discount rate is 12 percent and the tax rate is zero. Machine B Machine A Neither machine A nor B Both machines A and B Question 12 You are considering the purchase of one of two machines used in initially, and then $150 per year in maintenance costs. Machine maintenance costs. Either machine must be replaced at the end firm? The discount rate is 12 percent and the tax rate is zero. Machine B Machine A Neither machine A nor B Both machines A and B