Members of the choir are baking cookies for a fund-raiser. It costs $2.25 to make a dozen cookies, and the choir`s initial expences were $15.75. They sell the cookies for $4.50 a dozen. How many dozen do they have to sell to cover their costs?

Per dozen, the profit is $2.25

To make $15.75 profit, they need to sell $15.75 / 2.25 = 7 dozens.

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