If 20% of (A + B) = 30% of (A − B), then what percentage of B is equal to A?

If 50% of (x −y) = 30% of (x + y), then what percent of x is y? 

72 grams is what percent of 3.6 kilograms?

Mr. Kulbhushan spends 35% of his income on food, 25% on transportation and 80% of the remaining on house rent. What percent of his income he is left with?

The population of a city in the year 2020 was 2,00,000. The rate of growth of population is 8% per annum. Find the population of that city in the year 2022.

A man earns a profit of 60% when he sells an article at 4/3 of the original selling price. Find the percent profit he makes at original price.

In a moter of 120 machine parts, 5 % parts were defective, in another motor of 80 machine parts, 10 % parts were defective. For the two motors considered together, the percentage of defective machine parts were 

If a number is increased by 30 % and after that it is decreased by 25 % and again it is increased by 25 % then find average change in percentage? (approx.)