Jimbob Co. is a merchandising company that buys and resells tires for rally race cars. The company's income statements for the last two years are given below: ar This year 2,200 Units sold 2,000 Sales Less cost of goods sold Gross margin Less operating expenses Net income $330,000 220,000 110,000 65,000 45,000 $300,000 200,000 100,000 60,000 40,000 The company has no beginning or ending inventories. Required: a. Estimate the company's total variable cost per unit for operating expenses. b. What is the company's total of fixed costs per year? c. Compute the company's contribution margin for this year