Money Problems Maths - GCSE Maths - Steps, Examples & Worksheet Money problem maths examples Example 1: shopping A chocolate bar costs 45p 45p and a bottle of lemonade costs £1.20. £1.20. Frankie buys 3 3 bars of chocolate and 2 2 bottles of lemonade. She pays with a £5 £5 note. Work out how much change Frankie gets. Read the question carefully and work out how to solve the word problem.