So the demand curve is P = 200 - 3Q with a long run marginal cost of production is constant and equal to $20. What would be the consumer surplus if

So the demand curve is P = 200 - 3Q with a long run marginal cost of production is constant and equal to $20. What would be the consumer surplus if it was perfectly completive market? Whats the Dead weight loss if the market is a monopoly?