Chapter 3 3. RPM manufactures racks for CDs. Costs are S8.34 per rack. A wholesaler buys CD racks from RPM at $25.40 each, then sells them at $33.80 to retailers. The retailer sells the racks for $50.20each to consumers a) What is RPM's unit margin per rack (in dollars) when RPM sells the racks to the wholesaler? b) What is the retailer's dollar margin per rack? c) What is the percentage margin the retailer achieves per rack