There are 18 teachers in the fifth grade who come to work today, one of them is on personal leave and one is on sick leave. What is the attendance rate for this day?
五年级今天有18位教师来上班，有1人事假，1人病假，这一天的出勤率是多少
<gadget id="calculator">18 + 1 + 1</gadget>
<output>20</output>

<gadget id="calculator">18 / 20</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>