10% of a kind of saplings did not survive after trial planting, how many saplings should be planted at least in order to ensure that 360 saplings can be planted alive?
一种树苗经过试种有10%的未成活，为了保证种活360棵，至少要种多少棵树苗？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">360 / (9/10)</gadget>
<output>400</output>

<result>400</result>