A group of Metasequoia saplings will be planted around the "Hundred Surnames" square, and the survival rate of these saplings is 75%-80%. If you want to plant 1000 saplings, at least how many saplings should be planted.
"百家姓"广场周围要栽一批水杉树苗，这批树苗的成活率是75%-80%．如果要栽活1000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">1_000 / (4/5)</gadget>
<output>1_250</output>

<result>1_250</result>