Question 25 The following is a variable costing income statement: Not yet answered Points out of 4.00 Sales $750,000 P Flag question Variable manufacturing costs $200,000 Variable selling/admin. costs $150,000 Contribution margin $400,000 Fixed manufacturing overhead $ 50,000 Fixed selling/admin expense $ 75,000 Operating income $275,000 Determine the increase in operating income when sales increase by 8%. Select one: O a. $60,000 O b. $22,000 O c. $28,000 O d. $32,000