QUESTION 8 The monthly sales of Sunny Electronics' new sound system are given by q(t) = 6,000t- 60t2 units per month, t months after its introduction. The price Sunny charges is p(t) = 3,000 -t dollars per sound system, t months after introduction. (a) Find the rate of change of monthly sales. (b) Find the rate of change of price. per month (c) Find the rate of change of monthly revenue 5 months after the introduction of the sound system. $

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