Suppose that one factory inputs its goods from two different plants, A and B, with different costs, 4 and 10 each respective. And suppose the price function in the market is decided as p(x, y) = 100-z-y where and y are the demand functions and 0 ≤ x, y ≤ 30. Then as X= y" the factory can attains the maximum profit,

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Q: x-

A: