Solve the problem.The price p and the quantity x sold of a certain product obey the demand equation p = - 
x + 140, 0 ? x ? 560.What quantity x maximizes revenue? What is the maximum revenue?
A. 560; $19,600
B. 420; $14,700
C. 280; $19,600
D. 140; $14,700
Answer: C
Mathematics
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