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PERCENTAGES
`per cent' means `out
of 100'. There are
four types of
percentage
questions....…read more

Slide 3

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Type 1- Standard
Example 1­ calculate 30% of £500
30/100 X £500 = £150
Example 2­ 18 Student out of a class of 75 study dance. What percentage
is this?
18/75 X 100% =24%…read more

Slide 4

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Type 2 ­ Percentage Change
You can be asked to find a percentage increase or decrease, or profit
or loss.
You need to learn this formula...
Percentage change = Change/ Original
X 100%
Example ­ Lee bought a car for £3850. Ten months later, he sold
the car for £3200. Calculate his percentage loss, giving your answer
correct to 2 decimal places.
Change = 3850 -3200 = £650 loss.
So % loss = 650/3850 X 100% = 16.88%…read more

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Type 3 Increase/ decrease by a
percentage
To do these, you need to go through two steps...
Step 1 Work out the percentage increase(or decrease)
Step 2 Add (or take away) from the original amount.
Example ­ Sheila puts £2000 into a savings bond. Each year, the
value of her investment increases by 8%.
a) Calculate the value of her investment at the end of the first year.
The interest earned is 8% of £2000.
8% of 2000 = 8/100 X 2000 = £160.
So the value at the end of the first year is £2000 + £160 = £2160.…read more

Slide 6

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Type 4 ­ Finding the original
amount before a percentage
change.
Example ­ A surfboard has been reduced by 20% to £150. What was the
Amount after percentage change X 100/
original price?
Percentage
100% - 20% = 80% left, known
which is £150.
150 X 100/ 80
= £187.50…read more

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