help please

Campbell, Incorporated, sold 100,000 units last year for $2.00 each. Variable costs per unit were $0.30 for direct materials, $0.50 for direct labor, and $0.30 for variable overhead. Fixed costs were $60,000 in manufacturing overhead and $40,000 in nonmanufacturing costs. Required: a. What is the total contribution margin? b. What is the unit contribution margin? Note: Round your answer to 2 decimal places. c. What is the contribution margin ratio? d. If sales increase by 20,000 units, by how much will profits increase