Mike and Kim invest $18,000 in equipment to print yearbooks for schools. Each yearbook costs $5 to print and sells for $30. How many yearbooks must they sell before their business breaks even?

Each yearbook sells for $30 and costs $5 to print, so it contributes $25 toward paying back the equipment investment. Divide the $18,000 investment by $25 per yearbook: $18,000 ÷ $25 = 720. They must sell 720 yearbooks to break even, so the correct choice is 720.

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