3. Suppose that the total profit in hundreds of dollars from selling r items is given by P(x) = 212 -51 +6 (i) Find the average rate of change in profit for the following changes in z a) 2 to 4 b) 2 to 3 c) 2 to 2.5 d) 2 to 2.1 e) 2 to 2.05