Mary Smith owns and operates Blossom, 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 $711.500 Variable expenses 554,970 Contribution margin 156,530 Fixed expenses 73,480 Operating income $83,050 (a) What is Blossom's contribution margin per unit? Contribution margin per unit per cake