A certain kind of clothes costs 220 yuan each, and the price is reduced by 100 yuan. What percentage is the price reduction? What is the column
某种衣服每件220元，都降价100元，降价百分之几？列式是多少
<gadget id="calculator">100 / 220</gadget>
<output>5/11 = around 0.454545</output>

<result>5/11 = around 0.454545</result>