W&W Tax Service offers tax and consulting services to individuals and small businesses. Data for fees and costs for three types of tax returns is presented in the table below. Fixed costs total $39,680. Variable cont Type of Return Sales Mix Fee Charged per Return Easy $ 108 $ 64 Moderate 308 Business 558 501 258 208 154 204 The weighted-average contribution margin is: Multiple Choice 5243 $462 $924