The attendance rate of a certain morning in a grade is 98%, and 4 students are not present. How many people are there in this grade?
一个年级某一个早晨出勤率是98%，未出勤4人．这个年级有多少人．
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1 - (49/50)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">4 / (1/50)</gadget>
<output>200</output>

<result>200</result>