Answer:
A
Step-by-step explanation:
The marginal benefit of a production activity is the change in total benefit as a result of increasing quantity produced by one unit
Marginal cost is the change in total cost as a result of increasing the quantity produced by one unit.
An activity should be undertaken if the marginal cost is less than the marginal benefit. It means that the activity is profitable.
Here the marginal benefit = 400,000 x 4 = 2,000,000
the marginal benefit is greater than the marginal cost. Thus, the new salon can be established