To find out how much Christian paid for the haircut including the tip, we first calculate the amount of the tip.
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Calculate the tip: Tip = 20% of $18 Tip = 0.20 × $18 = $3.60
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Add the tip to the original cost of the haircut: Total cost = Cost of haircut + Tip Total cost = $18 + $3.60 = $21.60
So, the total amount Christian paid for the haircut is $21.60.
The correct answer is C. $21.60.