a. Assume that the same 10,000 unit volume is maintained in 2016 , but the sales price increases by 10 percent. Because of FIFO inventory policy, old inventory will still be charged off at $5 per unit. Also assume that selling and administrative expense will be 5 percent of sales and amortization will be unchanged. The tax rate is 34 percent. Compute aftertax income for 20XY. b. In part a, by what percent did aftertax income increase as a result of a 10 percent increase in the sales price? Explain why this impact occurred. c. Now assume in 20XZ the volume remains constant at 10,000 units, but that the sales price decreases by 15 percent from its 20XY level. Also, because of FIFO inventory policy, cost of goods sold reflects the inflationary conditions of the prior year and is $5.50 per unit. Further assume that selling and administrative expense will be 5 percent of sales and amortization will be unchanged. The tax rate is 34 percent. Compute aftertax income. a. Assume that the same 10,000 unit volume is maintained in 2016 , but the sales price increases by 10 percent. Because of FIFO inventory policy, old inventory will still be charged off at $5 per unit. Also assume that selling and administrative expense will be 5 percent of sales and amortization will be unchanged. The tax rate is 34 percent. Compute aftertax income for 20XY. b. In part a, by what percent did aftertax income increase as a result of a 10 percent increase in the sales price? Explain why this impact occurred. c. Now assume in 20XZ the volume remains constant at 10,000 units, but that the sales price decreases by 15 percent from its 20XY level. Also, because of FIFO inventory policy, cost of goods sold reflects the inflationary conditions of the prior year and is $5.50 per unit. Further assume that selling and administrative expense will be 5 percent of sales and amortization will be unchanged. The tax rate is 34 percent. Compute aftertax income