Can you all help me with this problem?

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:

Total number of meals served

Number of employees

Cooks

Waiters

1

2

3

4

5

200

380

540

660

740

120

230

310

360

390

Given the above information, and given the fixed payroll, the maximum number of meals that can be served is

a.240.

b.670.

c.850.

d.1,130.

e.none of the above

Thank you.