The service division of Flounder Industries reported the following results for 2022. Sales $450,000 Variable costs 270,000 Controllable fixed costs 56,250 Average operating assets 562,500 Management is considering the following independent courses of action in 2023 in order to maximize the return on investment for this division. 1. Reduce average operating assets by $112,500, with no change in controllable margin. 2. Increase sales $90,000, with no change in the contribution margin percentage. (a) Compute the controllable margin and the return on investment for 2022. Controllable margin Return on investment for 2022 $ %