There are 40 students in class 1 of 4, and 1 student asks for sick leave on Monday. What is the attendance rate of this class on that day?
四1班有学生40人，星期一请病假1人，这天该班的出勤率是多少．
<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">39 / 40</gadget>
<output>39/40 = around 0.975</output>

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

<gadget id="calculator">(39/40) * 1</gadget>
<output>39/40 = around 0.975</output>

<result>39/40 = around 0.975</result>