Work out a percentage increase or decrease
Percentage Increase or Decrease
In your GCSE Maths exam you will need to know how to work out a percentage increase or decrease multiple times! So, it is very important that you are comfortable with iworking out a percentage increase or decrease!
Let’s say a shop owner needs to increase all their prices by 5%.
To do this, for each price they work out 5% of it, and then add it on.
Example: 5% of £200 is £10, so to increasing £200 by 5% gives £210.
With a calculator, a faster way of doing this is just to multiply £200 x 1.05 = £210
To perform a percentage decrease, simply subtract the 5%
Example: 5% of £200 is £10, so to decreasing £200 by 5% gives £190.
With a calculator, a faster way of doing this is just to multiply £200 x 0.95 = £190
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