Lorri's income statement is as follows: Sales* $75,000 Less variable costs (24,000) Contribution margin $51,000 Less fixed costs (12,000) Net income $39.000 * 5,000 units sold If sales increase by 1,000 units, profits will: Select one: a. Increase by $7,800 b. Increase by $12,000 O C. Increase by $5,000 O d. Increase by $10,200