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.

Calculate the following:

a. Contribution margin per unit sold

b. Contribution margin ratio

c. Breakeven point in units

d. Units to be sold to earn the targeted operating income