Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
dollars. The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $270.00?
A. {x ? 20 < x < 28}
B. {x ? 18 < x < 30}
C. {x ? 24 < x < 36}
D. {x ? 19 < x < 29}
Answer: B
Mathematics
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A. 
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A. 
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