If the price of a commodity is decreased by 20% and its consumption is increased by 20%, what will be the increase or de- crease in the expenditure on the commodity?

The price of sugar is reduced by 20%. Now a person can buy 500g more sugar for ₹ 36. The original price of the sugar per kilogram was: 

When the tax on an article is increased by 20%, its consumption is decreased by 20%. In total tax receipt on this item-

if 20% of A = 50% of B, then what percentage of A is B?

A number is first decreased by 10% and then increased by 10%. The number so obtained is 50 less than the original number. The original number is:

The price of petrol is increased by 25%. By how much percent a car owner should reduce his consumption of petrol so that the expenditure on petrol would not be increased?

Under a discount scheme, a dozen pair of gloves quoted at ₹200 is available at a discount of 20%. How many pairs of gloves can be bought for ₹320?

The length of a rectangle is in- creased by 10% and breadth de- creased by 10%. Then the area of the new rectangle is: