The survival rate of a kind of sapling is 98%, in order to ensure 392 saplings survive, at least how many saplings should be planted.
一种树苗的成活率是98%，为了保证成活392棵，至少应种多少棵．
<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>