Money, Money, Money

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Across
  1. 1. A piece of paper that lists what you've bought
  2. 4. Money used in the USA
  3. 5. The money you get back when you pay more for something than it costs
  4. 6. The money used in the UK
Down
  1. 2. The money used in many European countries
  2. 3. Something sold for less than its usual price