The total cost of  producing 1 unit of a product is given by C(x,y)=30+10x2+20y-xy dollars Where x is the hourly labor rate and y is the cost per pound of raw materials. the current hourly rate is $15 and the raw materials cost $6 per pound. how will an increase of a)$1 per pound for the raw materials affect the total cost b)$1 in the hourly labor rate affect the total cost?

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