During a sale, the price of a pair of shoes is marked down by 10% from the regular price. After the sale ends, the price goes back to the original price. What is the percent increase (to the nearest whole number) form the discounted sale price to the regular price for the shoes?

বাংলাদেশ তেল, গ্যাস ও খনিজসম্পদ কর্পোরেশন (পেট্রোবাংলা) Titas Gas Co.Ltd - Deputy Asst. Engineer - 18.02.2011 গণিত শতকরা (Percentage) 2011