Lottie buys a pack of 40 cans of lemonade. She pays £10 for the cans.
Lottie sells 20 of the cans for 50p each. She sells the remaining cans for 20p each.
Work out Lottie's percentage profit. Give your answer correct to three significant figures.
222 exam-style questions on OCR GCSE Maths Percentage Change. Each one has a worked solution and a mark scheme showing where the marks go.