Lottie buys a pack of 50 cans of lemonade. She pays £17 for the cans.
Lottie sells k k\,k of the cans for 50p each. She sells the remaining cans for 20p each.
Work out Lottie's percentage profit in terms of kkk.
222 exam-style questions on WJEC GCSE Maths Percentage Change. Each one has a worked solution and a mark scheme showing where the marks go.