sume that a company's marginal cost function for the manufacture of x phones per hour is c(x) = 180 – 0.004x, d that they sell the phone for an average wholesale price of $540. Use a Riemann sum with n = 5 subdivisions to estimate the total additional hourly profit corresponding to an increase in production d sales from 10,000 to 20,000 phones per hour. (Use a left Riemann sum to find your answer.)

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