Chain or Compound Percentages
If £50 is increased by 10%, we calculate 10% of £50 and add the answer.
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% successively.
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