A pack of batteries is available in two different sizes.
Pack of 12 for £9.60 £9.60\,£9.60
Pack of 20 for £15.00 £15.00\,£15.00
Work out which pack offers the best value for money. You must show your working.
24 exam-style questions on Edexcel GCSE Maths Best Buy Questions. Each one has a worked solution and a mark scheme showing where the marks go.