A number is increased by 20% and then decreased by 20%. Net increase/decrease percentage?

The sum of two numbers is 520. If the bigger number is decreased by 4% and the smaller number is increased by 12%, then the obtained numbers are equal, then smaller number is :

A number is mistakenly divided by 4 instead of multiplied by 4. What is the percentage change in the result?

A's weight is 25% of B's weight and 40% of C's weight. What percentage of C's weight is B's weight?

A person spends 60% of income. Income increases by 15% and expenditure by 5%. Find percentage increase in savings.

Length of rectangle decreased by 20% and breadth increased by 20%. Effect on area?