PERCENTAGE – ANOTHER WAY OF COMPARING QUANTITIES Anita said that she has done better as she got 320 marks whereas Rita got only 300. Do you agree with her? Who do you think has done bette
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Converting Fractional Numbers to Percentage Fractional numbers can have different denominator. To compare fractional numbers, we need a common denominator and we have seen that it is more con
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Converting Decimals to Percentage We have seen how fractions can be converted to per cents. Let us now find how decimals can be converted to per cents. EXAMPLE Convert the given decim
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Fun with Estimation Percentages help us to estimate the parts of an area. EXAMPLE : What per cent of the adjoining figure is shaded? SOLUTION :We first find the fraction of
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USE OF PERCENTAGES Interpreting Percentages We saw how percentages were helpful in comparison. We have also learnt to convert fractional numbers and decimals to percentages. Now, we shall lear
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Converting Percentages to “How Many” Consider the following examples: EXAMPLE : A survey of 40 children showed that 25% liked playing football. How many children liked playing
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Ratios to Percents Sometimes, parts are given to us in the form of ratios and we need to convert those to percentages. Consider the following example: EXAMPLE : Reena’s mother said, to ma
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Increase or Decrease as Per Cent There are times when we need to know the increase or decrease in a certain quantity as percentage. For example, if the population of a state increased from 5,50,000 to
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PRICES RELATED TO AN ITEM OR BUYING AND SELLING The buying price of any item is known as its cost price. It is written in short as CP. The price at which you sell is known as the selling pr
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Profit or Loss as a Percentage The profit or loss can be converted to a percentage. It is always calculated on the CP. For the above examples, we can find the profit % or loss %. Let us co
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CHARGE GIVEN ON BORROWED MONEY OR SIMPLE INTEREST Sohini said that they were going to buy a new scooter. Mohan asked her whether they had the money to buy it. Sohini said her father was going to t
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Interest for Multiple Years If the amount is borrowed for more than one year the interest is calculated for the period the money is kept for. For example, if Anita returns the money at the end of t
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