The Axle Division of Bate Company makes and sells only one product. Annual data on the Axle Division's single product follow: Unit selling price, 50, Unit variable cost, 30, Total fixed costs, 200,000, Average operating assets, 750,000, and Minimum required rate of return, 12%. 23. If Axle sells 15,000 units per year, the residual income would be ______________. 24. If Axle sells 16,000 units per year, the return on investment would be ________ %. --------------------------------------------------------------------------------------------