To calculate how much Christian paid for the haircut, we first need to determine the amount of the tip he gave and then add it to the original charge for the haircut.
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Calculate the tip:
The tip is 20% of the haircut charge ($18).
\[ \text{Tip} = 20% \text{ of } 18 = 0.20 \times 18 = 3.60 \] -
Calculate the total amount paid:
Now, add the tip to the original charge.
\[ \text{Total amount paid} = \text{Haircut charge} + \text{Tip} = 18 + 3.60 = 21.60 \]
Thus, Christian paid a total of $21.60 for the haircut.