Missing digit riddle

John recently moved to his first brand new house. When he arrived there he discovered that the builder had forgotten something.
John popped down to the local DIY shop to enquire about the prices. Luckily the items are quite reasonably priced.
7 cost £1.00, 10 cost £2.00 and 100 cost £3.00.
What had the builder forgotten and how much will 210 cost?

SherlockHolmes Expert Asked on 13th June 2019 in Logic Puzzles.
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  • 1 Answer(s)

    The house numbers.
    The numbers cost $1 each so 210 will cost $3

    CugelTheWise Expert Answered on 24th June 2019.
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