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Year 8 Interactive Maths - Second Edition


Application of Percentages

Percentages are often used for calculations involving money in daily life.  The prices of most quantities increase (or decrease) by a percentage over time.  The changes in prices are often reported in newspapers as a percentage increase (or decrease).  Profit, loss, discount, commission and rates of interest can all be expressed as percentages.


Percentage Increase

Example 10

The price of a calculator increases from $15 to $18.  Express this increase as a percentage of the old price.

Solution:

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