Question

the price of sugar is increased by 20% by what percent must the consumption of the sugar be decreased so that the expenditure on sugar remain the same

Answer 1

let the price of 1kg suger be. Rs 100.
increased percentage =100+20% of 100
=Rs 120
In Rs120 we bought 1kg suger.
in Rs1 we bought 1/120kg
in Rs100 we bought 1/120
$1 \div 120 \times 100$