Refer to Fig. 6. As the lines of constant profit were lowered, the final line had slope
(a) Suppose that the profit per chair is changed from $80 to $ A, but that the profit per sofa remains at $70. Show that the lines of constant profit will each have slope
(b) Show that, when
(c) Use similar reasoning to show that the range of optimality for the profit per sofa is
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