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Question:

A restaurant bill without tax and tip comes to $38.40. If a 15% tip is included after a 6% tax is added to the amount, how much is the tip?

A $6.11
Explaination

The tax on the bill is $38.40 × 6% = $2.30. The amount, including tax, is $38.40 + $2.30 = $40.70. The tip is $40.70 × 15% = $6.11.