According to tests, the survival rate of a kind of saplings is in the range of 80% to 90%. If 360 saplings are to be planted alive, then at least how many saplings should be planted.
经试验，一种树苗的成活率在80%～90%范围内，如果要保证栽活360棵树苗，那么至少要栽多少棵树苗．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">360 / (4/5)</gadget>
<output>450</output>

<result>450</result>