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 $387.50?
A. {x ? 26 < x < 30}
B. {x ? 27 < x < 29}
C. {x ? 32 < x < 38}
D. {x ? 25 < x < 31}
Answer: D
Mathematics
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