A farmer owns 100 pigs, and each pig weighs 90 kilograms. One pig costs 20 pesos per day to keep. A pig’s weight increases by one kilogram every day. The selling price for a live hog today is 142 pesos per kilogram, and it drops by 1 peso every day. In order to maximize his profit, how many days should the farmer wait to sell his pigs after today?

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Q: flour

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A: We can find the answer as below.

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Q: A coal mine firm expected to produce 640 tons of coal.The firm invested OMR 42000 for mining.It was…

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A: