Digit C cannot be greater than 2, because then a minimum sum -
such as 31 x 425 - would produce a five-digit answer. This
knowledge, combined with the known XXX XXX shape of the interior
workings, makes it very likely that CD is 12. This is indeed the
case, and the complete sum is:
483 x 12 = 5796
Ivor Smith will receive £20 for this contribution.
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