The video tutorial explains the concept of percentages, their widespread use in various contexts such as discounts, interest rates, and population statistics. It provides a detailed understanding of what percentages mean, how to calculate them, and how to convert ratios into percentages. The tutorial also covers how to express changes in quantities as percentages, using practical examples to illustrate these concepts.

Which of the following is NOT a common use of percentages mentioned in the video?

• Population statistics

• Cooking recipes

• Interest rates

• Discounts during sales

If 15% of a population of 60,000 are school-going children, how many children are there?

• 6,000

• 12,000

• 9,000

• 15,000

Sam receives 70% of 60 toys. How many toys does he get?

• 24

• 18

• 48

• 42

In a staff of 40 people, 20% are women. How many women are there?

• 8

• 6

• 12

• 10

If 40 marbles are divided in the ratio 4:6, what percentage of marbles does Sam receive?

• 30%

• 60%

• 50%

• 40%

The number of two-wheelers in a city decreases from 20,000 to 15,000. What is the percentage decrease?

• 25%

• 20%

• 35%

• 30%

The demand for an item increases from 250 to 300. What is the percentage increase?

• 10%

• 15%

• 20%

• 25%