The price of a children's dress is 180 yuan. During the Christmas period, the mall reduced its sales by 5%, and after Christmas, it increased its sales by 5%.
A price reduction of 5% is180 * (1-5%) =171yuan.
A price increase of 5% is171* (1+5%) =179.55-171= 8.55 yuan.
Post-holiday fluctuation range (180-179.55)/180 = 0.25%.