The original price of a product is 100 yuan, the price is reduced by 10% on May 1st, and the price is increased by 10% after the 11th. Is the price of this product after the 11th more or less than 100 yuan?
某商品原价100元，"五一"降价10%，"十一"后又涨价10%，这种商品"十一"后的售价比100元多还是少？
<result>100</result>