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0580/22 Feb/Mar 2025, Question 11: Calculating a Percentage of a Quantity

Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Non-calculator · 10 marks

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The question, in short

Using a stacked percentage bar chart for January to March, complete the April bar and calculate shop sales, a percentage rise and a prior-year total.

Summarised in our own words. Use the official paper for the exact wording and the diagram.

Part (a) · 2 marks

April website sales are 17/20 of the total; add the April bar to the grid.

  1. 117/20 = 85%
  2. 2Draw the April bar with the website part shaded from 0% up to 85%
  3. 3Leave the top 15% (85% to 100%) unshaded for shops

AnswerGraph completed 85% on website with 15% in shops and correct shading

Part (b) · 3 marks

February sales total $3.5 million; determine the money taken in shops that month.

  1. 1Shops in February = 100 − 60 = 40%
  2. 240% of 3.5 million = 0.4 × 3.5
  3. 3= 1.4 million dollars

Answer1.4

Part (c) · 3 marks

Sales are $6 million in May and $7.5 million in June; find the percentage increase.

  1. 1Increase = 7.5 − 6 = 1.5 million
  2. 2Percentage increase = 1.5/6 × 100
  3. 3= 25%

Answer25

Part (d) · 2 marks

2024 sales of $52 million are 30% above 2023; work out the 2023 figure.

  1. 12023 sales × 1.30 = 52 million
  2. 22023 sales = 52 ÷ 1.3
  3. 3= 40 million dollars

Answer40

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