Two packs of toilet rolls are available in the supermarket
9 toilet rolls for £k£k£k
4 toilet rolls for £1.36 £1.36\,£1.36
Work out which pack offers the best value for money in terms of kkk. You must show your working.
84 exam-style questions on OCR GCSE Maths Best Buy Questions. Each one has a worked solution and a mark scheme showing where the marks go.