if 50% of (x-y) =30% of (x+y), then what percentage of x is y?

0.15% of $$33{1\over 3}\%$$ of ₹ 10000 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?

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?

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

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

32 is what percentage of 80?

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