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Problem 9:

Your dinner bill came to $27.83.  You decide to leave a 15% tip. 

1. You do not have a calculator with you.  Estimate what would be an appropriate amount to leave as a tip.  Show your work or explain how to get your answer.
2. You have a calculator with you.  What exact amount would be left as a tip.  Show your work or explain how to get your answer.