Joseph's income is decreased by 10%, by what percent the new income has to be increased to bring his income back to the previous level?

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: 

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?

In an examination, 45% of all the students who appeared are boys and the rest are girls. If 60% of the boys and 70% of the girls passed, then what is the percentage of students who failed?

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

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:

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

The Government reduced the price of sugar by 10 per cent. By this a consumer can buy 6.2 kg more sugar for ₹ 837. The reduced price per kg of sugar is: