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Discount, tax, and tip word problems

The cake store is having a 10%10\% off sale on all of its cakes. If the cake you want regularly costs $7\$7, how much would you save with the discount?
$ \$\
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}