A Firm Can Use 5 Workers and 10 Machines, 7

Multiple Choice

A firm can use 5 workers and 10 machines, 7 workers and 9 machines, or 8 workers and 9 machines to produce four cars. If each worker costs $200 and each machine is rented for $50, the economically efficient input combination is:

A) 5 workers and 10 machines.
B) 7 workers and 9 machines.
C) 8 workers and 9 machines.
D) 12 workers and 19 machines.