Monthly sales, S, of a product (in $1000) is a function of the monthly advertising (in $1000), a, spent and is modeled by S(a) = - 0.4a? + 21a + 8 Where 0 < a < 13 Monthly advertising is changing in time. Monthly advertising dollars are currently decreasing at $750/month and currently monthly advertising is $10,000 How fast is monthly sales changing? (include negative sign if decreasing, nearest $10/month) $/month

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