Class 5 and Class 2 planted a total of 320 saplings, but 64 of them did not survive. What is the survival rate of this tree planting?
五2班共栽植了320棵树苗，结果有64棵没活．这次植树的成活率是多少
<gadget id="calculator">320 - 64</gadget>
<output>256</output>

<gadget id="calculator">256 / 320</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>