An appliance company can sell x refrigerators at a price of p(x) = -0.02x + 500 dollars per refrigerator. The cost of manufacturing x refrigerators is given by C(x) = 300x + 6000 dollars. Find the rate of change of profit when 1500 refrigerators are produced. (The profit can be found by multiplying the price per refrigerator by the number of refrigerators sold then subtracting the cost from the price.) Provide your answer below: dollars per refrigerator

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