The students of a certain elementary school "Global Village" have achieved remarkable results in waste recycling activities. Last year, they recycled 720 kilograms of old newspapers and 600 kilograms of waste plastics. What percentage is recycled old newspaper heavier than waste plastic?
某小学"地球村"的同学们回收废品活动的成绩显著，去年共回收旧报纸720千克，废塑料600千克．回收的旧报纸比废塑料重百分之几？
<gadget id="calculator">720 - 600</gadget>
<output>120</output>

<gadget id="calculator">120 / 600</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>