certain factory manufactured 550 tractors in October, which was 50 units more than the original plan. How much was the excess?
某工厂10月份制造拖拉机550台，比原计划超额完成了50台，超额了多少．
<gadget id="calculator">550 - 50</gadget>
<output>500</output>

<gadget id="calculator">50 / 500</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>