Christian got a haircut yesterday afternoon. If the hair stylist charged $18 and Christian gave a 20% tip, how much did he pay for the haircut?
A. $3.60
B. $14.40
C. $21.60
D. $22.60
The tip amount is given by 20% of $18, which is (20/100) * $18 = $<<20/100*18=3.6>>3.60.
So the total amount Christian paid for the haircut is $18 + $3.60 = $<<18+3.6=21.6>>21.60.
Therefore, Christian paid $21.60 for the haircut, which corresponds to option C.