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Percentage of an amount
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EasyQuestion 1
[2 marks]Work out:
(a) 20% of £45
(b) 15% of 80 kg
Solution for Question 1
MediumQuestion 2
[3 marks]A laptop costs £650 plus VAT at 20%.
Work out the total cost of the laptop.
Solution for Question 2
HardQuestion 3
[4 marks]In a sale, all prices are reduced by 35%.
A jacket originally cost £85.
(a) Work out the sale price of the jacket.
(b) After the sale, the price increases by 35%. Is this the same as the original price? Explain.
Solution for Question 3
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There are several ways to find a percentage of an amount. The most reliable method is to convert the percentage to a decimal and multiply. For example, 35% of £80 = 0.35 × 80 = £28.
For mental maths, find easy percentages and combine them. To find 35%: find 10% (divide by 10), then multiply by 3 to get 30%, then add 5% (half of 10%). So 35% of 80 = 8 + 8 + 8 + 4 = 28.
When using a calculator, remember that "percent" means "per hundred" or "÷100". So 35% = 35 ÷ 100 = 0.35. Always check your answer is sensible - 35% should be about a third.
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