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'A Long Time at the Till' printed from http://nrich.maths.org/
Here are some hints:
Prime factorisation will probably be useful, as will working
in pence rather than pounds and pence.
There are lots of different possibilities to consider, so you will
need to be clear with your recording system.
To get a feel for the complexity, it is very unlikely that you will
be able to solve the first part of the problem in under two
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