A monopolist has a constant marginal cost of 18. Consumers' inverse demand is P = 43 - 4Q. The monopolist runs a persuasive advertising campaign that costs 10 and increases consumer demand to P = 48 - 4Q. (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?

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