How do I solve for this question?

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, the manager should hire

a.2 cooks and 4 waiters.

b.2 cooks and 5 waiters.

c.3 cooks and 2 waiters.

a.3 cooks and 4 waiters.

b.none of the above

Thank you.