The qualified rate of a textile is 98%, how many of the 300 products are unqualified.
一种纺织品的合格率是98%，300件产品中有多少件不合格．
<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">300 * (1/50)</gadget>
<output>6</output>

<result>6</result>