The graphs of the revenue and cost functions for the production and sale of x units are shown below. The cost function is the straight line, and the revenue function is the curve. 77000 70000 63000 56000 49000 42000 35000 28000 21000 14000 7000 100 200 300 400 500 600 700 800 900 1000 1100 1200 a. Use the graph to estimate the production level & that maximizes profit. Use only values that appear on the horizontal axis for your estimation. units b. What are the points (x, C(x)) and (x, R(x)) on the graphs of the cost and revenue functions corresponding to the value of x that maximizes profit? (x, C(x)) = Preview (x, R(x)) = Preview c. What is the maximum profit? $ d. If the cost per unit decreases, should the production level be raised or lowered to maximize profit? Select an answer v