Alex invests some money for 3 years in a savings account. She gets 4% per annum compound interest.
Alex has £k k\,k at the end of 3 years, work out, in terms of kkk, how much she invested.
208 exam-style questions on Eduqas GCSE Maths Repeated Percentage Change. Each one has a worked solution and a mark scheme showing where the marks go.