James recently moved to his first brand new house. When he arrived there he discovered that the builder had forgotten something.
James 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?
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