Question

class seventh CBSE board chapter 5 application of percentage worksheet 3 ​

Answer 1

Answer:

Application of Percentages CBSE Class 7 Maths

Application of Percentages – Percent means per hundred. It represents the fraction in which denominator is 100. Symbol of the percent is %. Percent represents either increment or deduction. Percentage helps in comparison.

If the percent value increases, it is called growth.

If the percent value decreases, it is called depreciation.

How to convert the fraction into the percentage?

Multiply given fraction by 100

Example a/b *100

Percent Variables

To solve the percent problem, one needs to understand the three variables

Percent

Part

Base

Example

30% of 1500 is 500

Percent-30, base -1500, part -500

25% 0f 500 is 125

Percent– 25, base-500, part -125

Percent as a ratio

Percent also represents the ratio where the first part is equal to the given percent and the second part is 100. To convert ratio into the percent, first you need to convert it into the lowest form of fraction further multiplying it by 100.

a:b = (ab x 100)

Example- a bag contains 2 red balls and 3 white balls. Find the percentage occupied by each.

Solution – Ratio 2:3

Percentage occupied by red balls

Total quantity = 5

Percentage

2/5 x 100 =40

3/5 x 100=60

Practice percentage with worksheets, quizzes, and learning modules. For details click Class 7 Maths .

Percent as a decimal

It can also be represented in the form of a decimal. If we have fraction then convert the fraction into a decimal by dividing the numerator by 100 or in short we can place decimal two digits left the numerator.

Application of percentage

Percentage increase

Amount of increase/base x 100

Percentage decrease

Amount of decrease/base x 100

Profit and loss

Profit refers to the money gained on selling an item

profit percentage = Profit / CP x 100, where profit= selling price – cost price

Loss refers to the money lost on selling an item

Loss percentage = Loss / CP x 100, where Loss= cost price – selling price

No profit no loss is when selling price = cost price

Simple Interest

Interest refers to the fees paid for borrowing a money.

P refers to the principal amount borrowed, R refers to the rate of interest and T refers to the time period for which amount is borrowed.

Simple interest (I) = P x R x T / 100

Amount represents total sum paid at the end of the time period.

Amount= Principal + Interest

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