ABC corporation produces and sells a single product. The company reported the following data: Sales revenue $779,000 Variable costs 506,000 Fixed costs 216,000 If the sales volume increases by 10%, which of the following is true Select one: a. Contribution margin will increase by $77,900. b. Operating income will increase by $50,600. c. Fixed expenses will increase by $21,600. d. Operating income will increase by $27,300.