Plant 50 trees, the survival rate is 98%, how many trees survived?
植树50棵，成活率是98%，活了多少棵．
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

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

<result>49</result>