In order to create a garden city in Xi'an, Qujiang New District needs to carry a batch of saplings. The survival rate of these saplings is 80% to 90%. If 720 trees are to survive, at least how many trees should be planted.
西安市为创建园林城市，曲江新区要载一批树苗，这批树苗的成活率是80%～90%，如果要成活720棵树，至少要栽种多少棵．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">720 / (9/10)</gadget>
<output>800</output>

<result>800</result>