Assume that a company's marginal cost function for the manufacture of x phones per hour was c(x) = 660 - 0.006x, and that they sell the phone for an average wholesale price of $1,300. Use a left Riemann sum with n = 5 subdivisions to estimate the total additional hourly profit (in dollars) corresponding to an increase in production and sales from 10,000 to 20,000 phones per hour?
