Answer:
Frank will be earning positive economic profit.
Step-by-step explanation:
Data provided in the question:
Number of Units sold for maximizing profit = 80 bushels of corn
Total variable cost = $120
Total fixed cost = $80
Marginal revenue = $4
Now,
Marginal revenue is defined as the additional revenue generated by on increasing the sales by one unit.
Here,
The marginal revenue is positive
Therefore,
Frank will be earning positive economic profit.