The correct rate of students doing oral calculations is 98%. In the exam, students get 4 questions wrong, and how many questions they get right.
生生做口算题的正确率是98%，考试中生生做错4题，生生做对多少题．
<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>

<gadget id="calculator">200 * (49/50)</gadget>
<output>196</output>

<result>196</result>