Chain or Compound Percentages

If £50 is increased by 10%, we calculate 10% of £50 and add the answer to £50.

£50+£5=£55

We could have obtained the same answer by multiplying £50 by

This method is especially convenient when an amount is increased several times by different percentages.

Suppose £50 is increased in turn by 10%, 15%, 20% and 25%.

To increase by 10% multiply by

To increase by 15% multiply by

To increase by 20% multiply by

To increase by 25% multiply by

To increase by 10% then 15% then 20% then 25%, multiply by

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