There are 50 people in Class 1 of the sixth year, and the absence rate today is 2%. How many people are there?
六年1班有50人，今天的缺勤率为2%，出勤的有多少人？
<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">50 * (49/50)</gadget>
<output>49</output>

<result>49</result>