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UKMT Senior Mathematical Challenge, 2016

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

On a Monday, all prices in Isla's shop are 10% more than normal. On Friday all prices in Isla's shop are 10% less than normal. James bought a book on Monday for £5.50. What would be the price of another copy of this book on Friday?

(A) £5.50 (B) £5.00 (C) £4.95 (D) £4.50 (E) £4.40

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