What is the output in perfect competition?

I'm having difficulty with this economic question.

An industry has constant average costs of production of £50 per unit of output. The industry demand is given by the relationship P = 230 - 3Qd

What would be the output of the industry under perfect competition?

Suppose the industry is taken over by a monopolist. What price would the monopolist charge to maximise its profits?

What is the level of the monopolists profit?

酷狗 地區限制

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).