A monopolist has a constant marginal cost of 16. Consumers' inverse demand is P = 45-5. The monopolist runs a persuasive advertising campaign that costs

A monopolist has a constant marginal cost of 16. Consumers' inverse demand is P = 45-5Ω. The monopolist runs a persuasive advertising campaign that costs 11 and increases consumer demand to P = 50 - 50Ω
(a) What is the gain (or loss) in the firms profits caused by the advertising campaign?
(b) When consumers' pre-advertising preferences are used to calculate welfare, what is the welfare gain (or loss) caused by the advertising campaign?
(C) When consumers' post-advertising preferences are used to calculate welfare, what is the welfare gain (or loss) caused by the advertising campaign?