The maximum profit occurs at the point (0, 40) and the profit amount is 200. All the clay is used in making plates. A-if the profit contribution of cups became 7, would that be within the allowable increase? Say yes or no.

B-with profit 7C + 5P, which point has more profit (0, 40) or (30, 0)?

C-so with profit 7C + 5P is the best point still (0, 40) like when profit was 4C + 5P? Say yes or no.