A shop sold 60% of its pens on Monday and 25% of the rest on Tuesday. What percentage of the pens was left?
- 15%
- 30%
- 35%
- 40%
Worked answer
- After Monday, 100% − 60% = 40% is left.
- 25% of the 40% = 10% sold on Tuesday.
- Left: 40% − 10% = 30%.
Answer: 30%
The mistake this question tests
Habit
Percentage of a new total
You took 25% of all the pens. Tuesday's 25% is of the rest, the 40% left after Monday.
How to fix it at home →Wrong answers children often give:
- 15% Percentage of a new total
- 40% Calculation slip
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See the answer →Practise PSLE percentage until the mistakes stop.
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