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The revenue achieved by selling x graphing calculators is figured to be x(240.5x) dollars. The cost of each calculator is $12. How many graphing calculators

The revenue achieved by selling x graphing calculators is figured to be x(240.5x) dollars. The cost of each calculator is $12. How many graphing calculators must be sold to make a profit (revenue-cost) of at least $67.50

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