Tim’s Bicycle Shop sells 21-speed bicycles. For purposes of a cost-volume-profit analysis, the shop owner has divided sales into two categories, as follows: Product Type Sales Price Invoice Cost Sales Commission High-quality $ 1,150 $ 490 $ 70 Medium-quality 570 270 60 Three-quarters of the shop’s sales are medium-quality bikes. The shop’s annual fixed expenses are $196,500. (In the following requirements, ignore income taxes.) Required: Compute the unit contribution margin for each product type. What is the shop’s sales mix