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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

When Louise had her first car, 50 litres of petrol cost £40. When she filled up the other day, she noticed that 40 litres of petrol cost £50. By approximately what percentage has the cost of petrol increased over this time?

(A) $50\%$ (B) $56\%$ (C) $67\%$ (D) $75\%$ (E) $80\%$

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