A toy factory produces small airplane model toys. It originally planned to produce 100 planes, but actually produced 120 planes. How many percent more than the original plan?
某玩具厂生产小飞机模型玩具，原计划生产100架，实际生产120架，比原计划增加百分之几？
<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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