The business manager of a company that produces in-ground outdoor spas determines that the cost (in dollars) of producing x spas in thousands of dollars is given by C(x)=0.04x² +4.1x+100 Find the average rate of change in cost if production is changed from 10 in-ground outdoor spas to 11 in-ground outdoor spas. $149,940 $145,000 $4,994 $4,940

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