A machine tool factory produced 720 machine tools last year, which was 120 more than the original plan. By what percentage did the actual number of machine tools produced last year exceed the original plan?
某机床厂去年生产机床720台，比原计划多生产机床120台，去年实际生产的机床数超过原计划的百分之几？
<gadget id="calculator">720 - 120</gadget>
<output>600</output>

<gadget id="calculator">120 / 600</gadget>
<output>1/5 = around 0.2</output>

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