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suppose that a kitchen appliance company's monthy sales and advertising expenses are approximately related by the equation xy-6x+20y=0, where x is thousands of dollars spent on advertising and y is thousands of dishwashers sold. Currently the company is spending 10 thousand dollars on advertising and is selling 2 thousand dishwashers each month. If the compant plans to increase monthly advertising expenditures at the rate of 1.5 thousand dollars per month, how fast will sales rise?

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