Today's sixth grade exercise rate is 98%, and 4 people are missing. How many people should there be in the whole grade?
今天六年级的出操率为98%，缺操4人，全年级应有多少人．
<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>