Banner Company had the following operating data for the current year: sales, $500,000; contribution margin $100.000; total fixed costs (controllable) $60,000, and average total operating assets, $200,000. If management is able to improve its contribution margin by $20.000 and hold its fixed costs constant, what would Banner's ROI be for the year? 30% 12% 50% 20%. Banner Company had the following operating data for the current year: sales, $500,000; contribution margin $100,000; total fixed costs (controllable). $60,000, and average total operating assets. $200,000. If management is able to improve its contribution margin by $20,000 and hold its fixed costs constant, what would Banner's Rol be for the year? O 30% 12%. 50% 20%