A car factory actually produced 300 cars in December, which was 60 more cars than planned. What percentage was the overproduction?
某汽车厂12月份实际生产300辆汽车，比计划多生产60辆，超产了百分之几？
<gadget id="calculator">300 - 60</gadget>
<output>240</output>

<gadget id="calculator">60 / 240</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>