If the price of cooking gas increases by 36% then by what per cent should a family decrease it's the of cooking gas. So that their expenditure on cooking gas remains the same as earlier?

The price of the cooking oil = x

The increased percentage of price = 36%

The new price of the cooking oil is x + 36x/100 = 136/100

Then reduction in consumption is 36x/100/136/100*100 = 26%