A premium parking service costs 6.8 pence per minute. An average customer parks for 18 minutes. The service had 39 customers on Monday.
Work out an estimate for the total amount paid by these customers.
Is your answer to part (a) an underestimate or an overestimate? Give a reason for your answer.
247 exam-style questions on AQA GCSE Maths Estimating. Each one has a worked solution and a mark scheme showing where the marks go.