15 12 points Chilton, Inc. sold 11,200 units last year for $20 each. Variable costs per unit were $3.00 for direct materials, $3.10 for direct labor, and $3.80 for variable overhead. Fixed costs were $60,000 in manufacturing overhead and $40,800 in nonmanufacturing costs. a. What is the total contribution margin? (Round your intermediate calculations to 2 decimal places.) b. What is the unit contribution margin? (Round your answer to 2 decimal places.) _;l c. What is the contribution margin ratio? (Round your intermediate calculations and nal answer to 2 decimal places.) % d. If sales increase by 2,040 units, by how much will profits increase? (Round your intermediate calculation to 2 decimal places and final answer to the nearest dollar amount.)