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​Q11: Answers – Paper 5 – November 2018

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• Increasing or Decreasing by a Percentage – Non-Calculator​

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• Increasing or Decreasing by a Percentage – Non-Calculator

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Question

11) The price of a washing machine is reduced by 20% for a sale.
Afterwards, the sale price is increased by 30%.

Joachim says

The washing machine is now 10% more expensive than before the sale.

Explain Joachim’s error and work out the correct percentage change in the price of the washing machine from before the sale to after the sale.

​Joachim’s error is .........................................................................................

​Correct percentage change is ..................................................... %

[6 marks]

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