Primary 6 · Percentage · Question type 3.3
An increase of 20% followed by a decrease of 20% does not restore the original price because the second change uses a different 100%.
Try the question yourself, or watch the lesson first.
Primary 6, on the MOE Primary Mathematics syllabus.
The lesson · 2 minutes 20 seconds
Watch: a bag up 20%, then down 20% of the new price, now $96
Another worked example
Mr Lim spends 60% of his monthly salary and saves the rest. In July his salary was 25% more than it was in June. He spent $360 more in July than in June. How much did Mr Lim save in July?
The working · Eleven lines
Written out in full, the way it should appear on paper.
The answer is $1200.
Practise · Modelled on top school exam questions
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Try it yourself
Try solving it yourself before checking your answer and working.
A library lent out 400 books in March. In April the number of books lent out fell by 25%. In May it rose by 20% of the number lent out in April. How many books did the library lend out in May?
Ans: 360
The practice plan adds more questions and saved progress.
The last type keeps one quantity unchanged while the total changes. Percentage Questions with an Unchanged Quantity →