Let the total variable cost of the monopolist firm is zero. Now, the profit will be the maximum where TR is maximum. That is, at the \\(6^{th}\\) unit of output the firm will be maximising its profit and the short run equilibrium price will be Rs 50.
Profit = TR − TC
= 300 − 100
Profit = Rs 200
If the total cost is Rs 1000, then the equilibrium will be at a point where the difference between TR and TC is the maximum.
TR is the maximum at the \\(6^{th}\\) level of output.
So profit = 300 − 1000
= −700
So, the firm is earning losses and not profit. As the monopolist firm is incurring losses in the short run, it will stop its production in the long run.