Answer:
The Hound Dog Bus Company should not expand
Explanation:
The decision to expand should be made if the incremental (marginal) cost to be incurred is less than the incremental revenue to be earned.
Incremental revenue = $60 (given)
Incremental cost = total cost - already incurred (non-incremental) cost
= 120 - 50 = $70.
Since the incremental revenue ($60) is less than the incremental cost ($70), the company should not expand.