Click on the image and please answer. And how you got it.

Answer: The price of the shirt becomes 14.4 after using the 20% off coupon. Why?
Step-by-step explanation:
Multiply the number by the percent ( 18* 20 = 360)
Divide the answer by 100 (e.g. 360/100 = 3.6)
18.00 - 3.6 = 14.4