The absence rate of students in our school today is 2%, and 539 people came to school. How many students are there in the school?
我校今天学生的缺勤率是2%，有539人到校上课．全校有学生多少人？
<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">1 - (1/50)</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">539 / (49/50)</gadget>
<output>550</output>

<result>550</result>