For a meeting, 250 people should be present, and the absence rate is 2%, how many people will be there.
某次会议，应到人数为250人，缺勤率是2%，到会有多少人．
<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">1 - (1/50)</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">250 * (49/50)</gadget>
<output>245</output>

<result>245</result>