The qualification rate of a batch of parts is 98%. If there are 392 qualified parts, how many parts are there in this batch?
一批零件的合格率为98%．如果合格的零件是392个，那么这批零件一共有多少个？
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">392 / (49/50)</gadget>
<output>400</output>

<result>400</result>