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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:
- Identify the Whole: Determine what the entire quantity or value represents. This will be your denominator or the 100% reference.
- Identify the Part: Determine the portion or value you want to estimate as a percentage of the whole.
- Estimate the Ratio: Divide the part by the whole to find the ratio. This ratio represents the fraction of the whole.
- Convert to Percentage: Multiply the ratio by 100 to express it as a percentage.
Here’s a formula to calculate an estimate in percentage:
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:
- Whole (total students) = 25
- Part (females) = 8
- Ratio = 8 / 25
- 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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