The workshop needs to produce 100 parts, 40 of which have been completed, how much of the total is completed.
车间要生产100个零件，已经完成了40个，完成的占总数的多少．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>