Motion Rollerblades has three product lines---​D, ​E, and F. The following information is​ available: ​ D E F Sales revenue ​$70,000 ​$40,000 ​$30,000 Variable costs ​(30,000) ​(5,000) ​(12,000) Contribution margin ​$40,000 ​$35,000 ​$18,000 Fixed costs ​(10,000) ​(15,000) ​(23,000) Operating income​ (loss) ​$30,000 ​$20,000 ​$(5,000) The company is deciding whether to drop product line F because it has an operating loss. Assuming fixed costs are​ unavoidable, if Motion drops product line F and does not replace​ it, what effect will this have on operating​ income?