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QMMaths

Reverse percentages

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Answers

    A washing machine goes up in price by 20%, now costing £300.

  1. What decimal would you multiply by to increase a price by 20%?
  2. The old price was multiplied by your answer from to get £300. Think how you would work backwards to get the original price. How much did the washing machine cost before the price change?

    3. A skirt is in a 10% sale and now costs £37.80.

  3. What decimal would you multiply by to decrease a price by 10%?
  4. The old price was multiplied by your answer from (a) to get £37.80. Think how you would work backwards to get the original price. What did the skirt cost before the sale began?

    5. Answer the following using the same technique as above.

  5. If my salary increases by 10% and I now earn £2090 per month, what was my monthly salary before the increase?
  6. If my weight drops to 56.28 kg due to illness and my weight has fallen by 16%, what did I weigh before?
  7. If my daughter’s height increases by 10% to 171.6 cm, how tall was she before her growth spurt?
  8. If I lose 13% of my £2436 savings on tax, what were my savings worth before tax?