The question first presents a "percentage of a total" used.
Followed by another "percentage of remaining" used.
A value is given for the amount "left"
Such questions are similar to "fraction of remaining" and
usually appear in Paper 2 of P5 or P6 exams.
Calculator usage is allowed.
Wendy has a a full tank of petrol in her car at first.
30% of the petrol was used when she drove from home to her aunt's place.
She used 20% of the remaining petrol to ferry her aunt to the city.
She has has 28 litres of fuel remaining in the car.
How much fuel did she have at first?
If the above question is easy, try to do the more challenging question below.
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