3.3.1

Percentage Increase/Decrease

Test yourself

Percentages

How do we find the new price of something after a percentage increase or decrease?

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Example 1

  • If an item originally costing £30 has its price risen by 50%, what is its new price?
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Example 1

  • If an item originally costing £30 has its price risen by 50%, what is its new price?
    • A 50% increase means the new price is 150% of the original.
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Example 1

  • To find 150% we divide by 10 then multiply by 15.
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Example 2

  • If an item originally costing £70 has it's price reduced by 40% what its new price?
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Example 2

  • If an item originally costing £70 has it's price reduced by 40% what its new price?
    • A 40% decrease means the new price is 60% of the original.
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Example 2

  • To find 60% we divide by 10 then multiply by 6.

Jump to other topics

1Number

1.1Place Value

1.2Factors & Multiples

1.3Operations

1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units

1.7Accuracy

2Algebra

3Ratio, Proportion & Rates of Change

4Geometry & Measures

5Probability

6Statistics

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