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A monopolist has discovered that the inverse demand function of a person with income M for the monopolist's product is p = 0.002M-q. The monopolist is able to observe the incomes of its consumers and to practice price discrimination according to income (second-degree price discrimination). The monopolist has a total cost function, c(q) = 100q. The price it will charge a consumer depends on the consumer's income, M; according to the formula: