In a department store, each pair of sneakers with an original price of 1,600 yuan is unsalable. The company decides to reduce the price by n% for promotion, but it still cannot be sold. Finally, the price after the price reduction is reduced by n%, and the result is that the price of each pair of sneakers is 1024 yuan. n = how much.
百货公司里每双原价1600元的球鞋滞销，该公司决定减价n%促销，但仍然卖不出去．最后以减价后的价格再减n%销售，结果每双球鞋的售价为1024元．n=多少．
<result>20</result>