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'Valuable Percentages' printed from http://nrich.maths.org/
Which of the following has the greatest value?
A) 50% of 10
B) 40% of 20
C) 30% of 30
D) 20% of 40
E) 10% of 50
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.