There are 40 students in a class and 38 attendees, what is the absenteeism rate?
某班有学生40人，出席38人，缺勤率是多少．
<gadget id="calculator">40 - 38</gadget>
<output>2</output>

<gadget id="calculator">2 / 40</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">(1/20) * 1</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>