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Mathematics, 18.07.2019 18:00 giannimaraj711

Dorothy wagner is currently selling 90 "i ♥ calculus" t-shirts per day, but sales are dropping at a rate of 7 per day. she is currently charging $7 per t-shirt, but to compensate for dwindling sales, she is increasing the unit price by $1 per day. how fast, and in what direction, is her daily revenue currently changing?

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