A beverage factory produced 180 cases of beverages in June, which was 30 cases more than the original plan. By what percentage?
某饮料厂六月份生产饮料180箱，比原计划超产30箱，超产百分之几？
<gadget id="calculator">180 - 30</gadget>
<output>150</output>

<gadget id="calculator">30 / 150</gadget>
<output>1/5 = around 0.2</output>

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