Holly invests £500 \pounds 500\,£500 for 4 years in a bank account. The account pays simple interest. Holly has got £30 \pounds 30\,£30 interest at the end of 4 years. Work out the rate of interest per year.
199 exam-style questions on OCR GCSE Maths Percentages. Each one has a worked solution and a mark scheme showing where the marks go.