owns and operates Crane, a bakery that creates personalized birthday cakes for a child's first birthday. The cakes, which sell for $50 and feature an edible picture of the child, are shipped throughout the country. A typical month's results are as follows: Sales revenue $621,000 Variable expenses 484,380 Contribution margin 136,620 Fixed expenses 101,200 Operating income $35,420 (a) What is Crane's contribution margin per unit? Contribution margin per unit