Example 1 The total revenue R and the total cost C function of a firm are given by R=30x– x² and C= 20+ 6x. %3D (a) Find the marginal revėnue and marginal cost. (b) Find the rate of change in R when x 2. (c) Show that the rate at which cost increases with increase in output is constant. (d) Find the average revenue and average cost.

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