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 amount of the tip is 20% of the cost of the haircut, which is 20/100 * 18 = $<<20/100*18=3.60>>3.60.
Christian paid $18 + $3.60 = $<<18+3.60=21.60>>21.60 for the haircut.
Therefore, the correct answer is C. $21.60.