Given the following scenario, what is the percent of manufacturing overhead the supplier is including in the selling price? 7 "A supplier sells a spare part for $75 per unit. The net profit and selling, general, and administrative are a total of 15 % of the selling price. Direct material costs are 20 % of the selling price, and the ratio of direct material costs to direct labor costs is 1.20 (for every dollar of materials, it is 1.20 dollars in labor)." a. 20% b. 15% c. 120% d. 41% e. None of the above