Answer:
Option C. Marginal revenue will equal marginal cost for the 801st bushel of wheat.
Step-by-step explanation:
The reason is that the average revenue of the firm is $6 ($4,800/800) which means the average marginal revenue is $6 and what we must consider now is the cost at 800 bushels and 801 bushel.
Case 1. So the increase in the average cost for 800 bushels is $4,800 which means unit marginal cost per bushel is $6 ($4800/800).
Case 2. For 801 bushel, the total cost increases to $4806 which is $6 marginal cost per unit increase.
Hence, the marginal revenue becomes equal to marginal cost at this point.
So the option C is correct.