The price of coal rises by 25%. If a family wants
suo to keep its expense for coal same, by what per
cent should it decrease its coal consumption ?
The price of coal rises by 20%. A family reduce
the consumption of coal by 20%. By how much
percent will the expenses for coal of that family
be increased or decreased?
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=738√728÷π×589∆68
=√6885×√765÷√7544
=......739
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