In order to green the city, a group of saplings are planted in a certain street. The survival rate of these saplings is 75% to 80%. If 2400 saplings are to be planted alive, how many saplings should be planted at least.
为绿化城市，某街道栽种一批树苗，这批树苗的成活率是75%～80%，如果要栽活2400棵树苗，至少要栽种多少棵．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_400 / (4/5)</gadget>
<output>3_000</output>

<result>3_000</result>