Lisa Anderson owns and operates Wildhorse, 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 $768,000 Variable expenses 537,600 Contribution margin 230,400 Fixed expenses 104,700 Operating income $ 125,700 (a) What is Wildhorse's contribution margin per unit? Contribution margin per unit $ per cake