The factory produced a total of 240 machines this year, 40 more than last year. By what percentage is this year's increase compared to last year?
工厂今年共生产机器240台，比去年多生产40台，今年产量比去年增产百分之几？
<gadget id="calculator">240 - 40</gadget>
<output>200</output>

<gadget id="calculator">40 / 200</gadget>
<output>1/5 = around 0.2</output>

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