Problem 3. (4 pts) Randolph runs a lemonade stand and wants to make $150 in the next week. He sells each cup of lemonade for $0.75, while the variable cost is $0.15 for the cups and ingredients. Fixed costs such as posters and signs are $15.00. Calculate the following: a. Contribution margin per unit sold b. Contribution margin ratio c. Breakeven point in units d. Units to be sold to eam the targeted operating income