A factory planned to produce 600 machine tools in March this year, but actually produced 720. What percentage was the overproduction?
某厂今年3月份计划生产机床600台，实际生产720台，超产百分之几？
<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>