job started on June 1st and was originally scheduled to be completed in one month. During the actual construction, the task was completed on June 25th, and how much was overfulfilled by June 30th.
一项工作，6月1日开工，原定一个月完成，实际施工时，6月25日完成任务，到6月30日超额完成多少．
<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">30 * (1/25)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 1</gadget>
<output>1/5 = around 0.2</output>

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