To calculate the total amount Christian paid for the haircut, we need to find the tip amount and add it to the original haircut cost.
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Calculate the tip:
- The cost of the haircut = $18
- Tip percentage = 20%
- Tip amount = 20% of $18 = 0.20 * 18 = $3.60
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Calculate the total cost:
- Total cost = Cost of haircut + Tip amount
- Total cost = $18 + $3.60 = $21.60
Therefore, the answer is C. $21.60.