There are 27 people in class 61 who arrived at school today, 2 of them are on sick leave, and 1 is on personal leave. What is the attendance rate of class 61 today?
六1班今天到校27人，有2人病假，1人事假，六1班今天的出勤率是多少．
<gadget id="calculator">27 + 2 + 1</gadget>
<output>30</output>

<gadget id="calculator">27 / 30</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>