A factory can produce R rugs a month based on the function R(n) 4n2 – 7n +58, where n is the number of production lines that are operational. The number of production lines that are operational is determined 15 by n(x) + 20x, where x is the number of managers overseeing a production line. What are the units when calculating the rate at which the rug production is changing when there are 4 managers to oversee the production lines?

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