if the price of petrol increases by 32 , 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 + 32 ) i . e 132 . now , his consumption should be reduced to : - = ( 132 − 100 ) / 132 ∗ 100 . hence , the consumption should be reduced to 24.2 % . answer : c
multiply(subtract(const_1, divide(const_100, add(const_100, 32))), const_100)