While percentage simply means a fraction of 100, the concept of percentage becomes complex when the terms such as percentage increase or decrease is in play.
Such questions usually appear in P5 and P6 exams in Paper 2.
Calculator usage is allowed.
In June, Alan was given an allowance of $200.
Alan spent 20% of his allowance on food and 30% of the allowance on transport.
He saved the remaining of the allowance in June.
In July, he was given less allowance.
So he spent 20% lesser on food but spent the same amount on transport and saved the same amount as in June.
What was the percentage decrease of his allowance in July?
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