The accounting records for Portland Products report the following manufacturing costs for the past year. Direct materials $ 390,000 Direct labor 261,000 Variable overhead 235,000 Production was 180,000 units. Fixed manufacturing overhead was $851,000. For the coming year, costs are expected to increase as follows: direct materials costs by 20 percent, excluding any effect of volume changes; direct labor by 4 percent; and fixed manufacturing overhead by 10 percent. Variable manufacturing overhead per unit is expected to remain the same. Required: a. Prepare a cost estimate for a volume level of 144,000 units of product this year. b. Determine the costs per unit for last year and for this year.