Suppose that a companys sales volume, y (in thousands of units) is related to its advertising expenditure, x (in thousands of dollars) according to: xy - 20x + 10y = 0. (xy minus 20x plus 10y equals zero) Find the rate of change of sales volume with respect to advertising expenditures when sales volume is $10,000 and advertising expenditure is $10,000. O 10002 O 0.5 O -0.997 O 10.002

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