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

Scientists developed the first successful human cell culture in vitro (grown in a lab) in the 1950s by removing cancer cells from a woman. this concept has allowed modern scientists to successfully grow organs. which of the following answers  bestdetermines why there was success?   neurons send a signal to the cell to multiply. a large blood supply to the cell allows enough nutrients for growth. cells are the basic unit of life and thus can regenerate if in a controlled environment. cells cannot reproduce on their own, and the scientist manipulates them to grow.