In a community activity, the number of people who should participate is 50, but 10 people did not show up, what is the attendance rate?
一次社团活动中，应参加的人数是50人，但有10人未到，出席率是多少
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 50</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>