The service division of Retro Industries reported the following results for 2022 Sales $500,000 Variable costs 300,000 Controllable fixed costs 65,840 Average operating assets 516,000 Management is considering the following independent courses of action in 2023 in order to maximize the return on investment for this division. 1. 2. Reduce average operating assets by $116,000, with no change in controllable margin. Increase sales by $104,490, with no change in the contribution margin percentage. (a) Calculate the controllable margin and the return on investment for 2022. (Round ROI to 2 decimal places, eg. 1.25%) Controllable margin Return on investment % eTextbook and Media Save for Later Attempts: 0 of 3 used Submit Answer (b) The parts of this question must be completed in order. This part will be available when you complete the part above