Stuart Manufacturing produces metal picture frames. The company's income statements for the last two years are given below: Last year This year Units sold 50,000 70,000 Sales $800,000 $1,120,000 Cost of goods sold 550,000 710,000 Gross margin 250,000 410,000 Selling and administrative expense 150,000 190,000 Net operating income $100,000 $ 220,000 The company has no beginning or ending inventories. Required: a. Estimate the company's total variable cost per unit and its total fixed costs per year. (Remember that this is a manufacturing firm.) b. Compute the company's contribution margin for this year.

Special order carson manufacturing, inc., sells a single product for $36 per unit. at an operating level of 8,000 units, variable costs are $18 per unit and fixed costs $10 per unit. carson has been offered a price of $20 per unit on a special order of 2,000 units by big mart discount stores, which would use its own brand name on the item. if carson accepts the order, material cost will be $3 less per unit than for regular production. however, special stamping equipment costing $4,000 would be needed to process the order; the equipment would then be discarded. assuming that volume remains within the relevant range, prepare an analysis of differential revenue and costs to determine whether carson should accept the special order. use a negative sign with answer to only indicate an income loss from special order; otherwise do not use negative signs with your answers.