If the duty on an article is reduced by 40% of its present rate by how much per cent must its consumption increase in order that the revenue remains unaltered?

Priyanshu's salary was reduced by 10% and then the reduced salary was increased by 10%. His new salary in comparison with his original salary is:

B got 20% marks less than A. What per cent marks did A got more than B? 

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

A number is first increased by 10% and then it is further increased by 20%. The original number is increased altogether by:

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 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:

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: