There are 40 students in Class 1 of the sixth grade, and 38 students came to school today. What is the absence rate of this class today?
六年级一班有40人，今天到校38人，该班今天的缺勤率是多少．
<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>