Consider a firm that initially is a monopolist. The government decides to intervene in the market and restore perfect competition by removing barriers to entry. In the perfectly competitive market, supply and demand are given by Q=2/3P - 4/3 and Q=28-2P.

What is the change in profit that the monopolist experiences when the market is converted to a perfectly competitive one?

Please see graph below, please help me solve this hw problem. Thank you