Answer:
if the government decides to regulate this natural monopoly by forcing them to produce at the point where the demand curve intersects marginal cost, then the firm will make a LOSS OF $33 MILLION and WILL NOT continue in the long run.
Step-by-step explanation:
When the production output increases from 4 to 5 million therms, the marginal cost of production is $20 million (= 133 - 113) and the marginal revenue is also $20. At this point, the company will be maximizing its accounting profit and its economic profit will be $0
The accounting profit/loss will = $100 million - $133 million = -$33 million