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Comparing quantities 7.2

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Problem

The pie store is having a 20% off sale on all of its pies.
If the pie you want regularly costs $18, how much would you save with the discount?
$ 
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi