Exercise 7.3 class 8 solution

Exercise 7.3 class 8 solution-Introduction

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Exercise 7.3 class 8 solution- Estimation in percentage

Estimation in percentage involves making an educated guess or approximation of a quantity or value as a percentage of a whole. This is often done when you don’t have precise data but want to provide a rough estimate. To estimate in percentage, follow these steps:

1. Identify the Whole: Determine what the entire quantity or value represents. This will be your denominator or the 100% reference.
2. Identify the Part: Determine the portion or value you want to estimate as a percentage of the whole.
3. Estimate the Ratio: Divide the part by the whole to find the ratio. This ratio represents the fraction of the whole.
4. Convert to Percentage: Multiply the ratio by 100 to express it as a percentage.

Here’s a formula to calculate an estimate in percentage:

Percentage Estimate=(Part/Whole)×100%

For example, if you have a class of 25 students and you want to estimate what percentage of the class is female (assuming you don’t have exact data), and you count 8 females, you can estimate:

1. Whole (total students) = 25
2. Part (females) = 8
3. Ratio = 8 / 25
4. Percentage Estimate = (8 / 25) * 100% = 32%

So, you might estimate that approximately 32% of the class is female.

Estimation in percentage is useful in various situations, from finance to demographics, and can help provide a rough idea of proportions when precise data is unavailable or impractical to obtain.

Exercise 7.3 class 8 solution – Examples of the exercise .

Example 7.3.1. estimate the bill amount to be paid,if

(i) bill is Rs 669.70 and discount is 10%

(ii) bill is 1008 and discount is 10%

Solve.Round the bill to nearest tens ,here bill is 669.70,so its nearest tens is Rs 670.

10% of an amount = (10/100) * Amount

its nearest tens is Rs70

so estimated bill amount to pay =Rs 670 – Rs 70 =Rs 600

(ii) Bill amount is Rs1008 ,its nearest tens is Rs 1010

Discount Amount = 10% of the Bill Amount

its nearest to Rs 100

Estimated bill amount to pay is Rs 1010-100=910

Exercise 7.3 class 8 solution- exercise preview

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Exercise 7.3 class 8 solution- solution pdf

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