Answer:
The marginal revenue = $2
Step-by-step explanation:
Firstly we calculate the value in dollars for the number of boxes sold
For 100 boxes, we have 100 * 2 = $200
For 200 boxes, we have 200 * 2 = $400
Mathematically, the marginal revenue = (cost of 200 boxes- cost of 100 boxes)/difference in quantity
= (400-200)/(200-100) = 200/100 = $2
Thus affirms the fact that for a perfectly competitive firm, marginal revenue MR = P (price)