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数学题,求步骤Your budget constraint for the two goods A and B is 1

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数学题,求步骤
Your budget constraint for the two goods A and B is 12A + 4B = I, where I is your income. You are currently consuming more than 27 units of B. In order to get 3 more units of A, how many units of B would you have to give up?
你的两商品A和B的预算约束是12A+4B =I,I是你的收入.你现在消耗了27单位以上的B.为了再获得3个单位以上的A,有多少单位的B你会放弃? 答案是9,但是怎么算的?
27单位以上的B即至少是28单位B,而3个单位以上的A至少是4个单位A,显然28B