A travel agency will plan a tour for groups of size 8 or larger. If the group contains exactly 8 people, the price is $800 per person. However, each person's price is reduced by $10 for each additional person above the 8. If the travel agency incurs a price of $100 per person for the tour, what size group will give the agency the maximum profit?
??
A. 
B. 
C. 
D. 
E. 
Answer: C
Mathematics
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