The school planted a batch of saplings, the survival rate was 98%, and 4 died. How many saplings are there in this batch?
学校栽一批树苗，成活率为98%，4棵死亡，这批树苗有多少棵．
<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>

<result>200</result>