Suppose that the weekly sales volume y (in thousands of units sold) depends on the price per unit (in dollars) of the product according to the following formula. y = 33(3p + 1)-2/5, p> 0 (a) What is the rate of change in sales volume when the price is $18? (Round your answer to three decimal places.) dy = -.145 dp (b) Interpret your answer to part (a). (Round your answer to the nearest whole number.) If the price increases $1, the sales volume will decrease by x units.

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