By what quantity the use of coal is to be reduced to keep one's family budget...

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By what quantity the use of coal is to be reduced to keep one's family budget same when the price of coal is increased by 50%? 1. 25% 2. 20% 33.33% 15% 5. бб.бб% 3. 4. By what quantity the use of coal is to be reduced to keep one's family budget same when the price of coal is increased by 50%? 1. 25% 2. 20% 33.33% 15% 5. бб.бб% 3. 4.

Answer rating: 100% (QA)

Solution 3 Let the initial coal used by family be denoted by X units and the initial cost ... View the full answer