Ruth Lewis owns and operates SunlandCakes, a bakery that creates personalized birthday cakes for a child's first birthday. The cakes, which sell for $40 and feature an edible picture of the child, are shipped throughout the country. A typical month's results are as follows: Sales revenue $832.000 Variable expenses 624,000 Contribution margin 208,000 Fixed expenses 114.000 Operating income $94,000 How many cakes will Ruth Lewis have to sell if she wants to earn $153,000 in operating income each month? cakes