if the price of petrol increases by 25 , by how much must a user cut down his consumption so that his expenditure on petrol remains constant ?
"explanation : let us assume before increase the petrol will be rs . 100 . after increase it will be rs ( 100 + 25 ) i . e 125 . now , his consumption should be reduced to : - = 125 − 100125 ∗ 100 . hence , the consumption should be reduced to 20 % . answer : b"
multiply(subtract(const_1, divide(const_100, add(const_100, 25))), const_100)