A restaurant hires cooks and waiters. Cooks earn $10 an hour; waiters earn $5 an hour. The manager, who wants to maximize the number of meals served given a fixed payroll of $45 per hour, expects the following from cooks and waiters: 
Given the above information, and given the fixed payroll, the maximum number of meals that can be served is
A. 670.
B. 850.
C. 1,130.
D. 240.
E. none of the above
Answer: B
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