ajay spends 50 % of his monthly income on household items , 25 % of his monthly income on buying cloths , 15 % of his monthly income on medicines and saves the remaining amount which is rs . 9000 . find his monthly income .
savings 10 % - 9000 expenditure 90 % - 81000 total - 90000 answer : a
divide(9000, divide(subtract(const_100, add(add(50, 25), 15)), const_100))