Dorothy Taylor owns and operates Sandhill, a bakery that creates personalized birthday cakes for a child's rst birthday. The cakes, which sell for $64 and feature an edible picture of the child, are shipped throughout the country. A typical month's results are as follows: Sales revenue $784,000 Variable expenses 588,000 Contribution margin 196,000 Fixed expenses 124,640 Operating income $ 71,360 (a) What is Sandhill's contribution margin per unit? Contribution margin per unit $ per cake