Planting one kind of saplings has a survival rate of 94%. In order to ensure that 470 saplings are planted alive, at least how many saplings should be planted.
栽一种树苗，成活率为94%，为保证栽活470棵，至少要栽树苗多少棵．
<gadget id="calculator">94 / 100</gadget>
<output>47/50 = around 0.94</output>

<gadget id="calculator">470 / (47/50)</gadget>
<output>500</output>

<result>500</result>