A beverage processing factory produced 150 cases of beverages in July, which was 30 cases more than the original plan. By what percentage?
一个饮料加工厂七月份生产饮料150箱，比原计划超产30箱，超产百分之几？
<gadget id="calculator">150 - 30</gadget>
<output>120</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

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