My local greengrocery, ‘Apple and Pears’ (known as ‘AP’ for short), charges 24p for the first apple bought, 23p for the second, 22p for the third, and so on, each apple costing 1p less than the one before.
How much change should I receive if I buy 9 apples and I give the shopkeeper £2?
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Intermediate Mathematical Challenge 2002 (2002)
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