Money and value

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Across
  1. 2. to need to pay someone
  2. 4. money taken away from the origial price
  3. 5. having a very high value
  4. 7. money that you get for doing something helpful
  5. 8. extra money to thank someone for a service
Down
  1. 1. money that's paid back to you if you return something
  2. 3. available at a good price
  3. 6. something you get at a really good price