Solve the problem.The profit made when t units are sold, t > 0, is given by 
Determine the number of units to be sold in order for P > 0 (a profit is made).
A. 20 < t < 10
B. t = 30
C. t = 20 or t = 10
D. t > 20 or t < 10
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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