Percentage Change
Maths: Edexcel IGCSE Higher, topic 1.6.2
Percentages
If an item originally costing £30 has its price risen by 50%, what is its new price?
We need to calculate a 50% increase on £30
50% increase will give 150% in total
This is the same as multiplying by 1.5 (divide 150 by 100)
So the new price is £45
Percentage Change
Format
- If you are calculating the percentage increase then change = new - old.
- If you are calculating a percentage decrease then change = old - new.
Example
- If someone buys ingredients for £20 and sells pancakes using those ingredients for £35 then their profit is £35 - £20 = £15.
- They make 75% profit as shown in the image.
Test yourself on Percentage Change
If a donkey costing £50 increases in price by 40%, what does it now cost?
If a donkey costing £50 increases in price by 40%, what does it now cost?
If a donkey costing £250 increases in price by 10%, what does it now cost?
If a loaf of bread originally cost £2 but has had its price discounted by 20%, what is its new price?
If a loaf of bread originally cost £4 but has had its price discounted by 10%, what is its new price?