Answer:
a. $6,000
Step-by-step explanation:
Since the new machine has increased the production by 200 units, therefore the marginal revenue shall be recognised with reference to the new 200 units produced by the new machine.
The marginal revenue shall be calculated as follow:
Marginal revenue=marginal units*revenue per unit
Marginal revenue=200*30
=$6,000
So the answer is a. $6,000