The total amount that Luke will pay is $31.05.
From the information given, it was stated that Luke went to a restaurant and his bill was $27.00 and that he wants to leave a 15% tip.
Therefore, the amount that he'll pay to the restaurant will be:
= $27.00 + (15% × $27)
= $27.00 + (0.15 × $27)
= $27.00 + $4.05
= $31.05
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