Generally, the price of tattoos is charged according to the area. The price found by Bian Xiao from the Plastic Surgery Center of the Second Hospital of Guangzhou Medical University is about 5 square centimeters, which is around 360 yuan for the first time, and then it is 30% off every time. Depending on the depth of the tattoo, it takes about 3 to 5 times. According to the calculation of at least three times, it costs 360+360×0.7+360×0.7=864 yuan per square centimeter to wash off the tattoo.