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Answer to Problem 9:

 The original price should be about $15 greater.  One estimate is generated by knowing that $33.59 is close to $35 which would be 7 fives, so if the price was reduced by 30% there were about 3 fives removed.  Putting back the 3 fives is where the $15 estimate is generated.

Estimate:

 $33 + $15 =$48

Actual: