The green team participated in the tree planting activity and planted a total of 400 trees, 10 of which did not survive. What is the survival rate of this batch of trees?
绿色小队参加植树活动，共植树400棵，有10棵没有成活，这批树的成活率是多少？
<gadget id="calculator">400 - 10</gadget>
<output>390</output>

<gadget id="calculator">390 / 400</gadget>
<output>39/40 = around 0.975</output>

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

<gadget id="calculator">(39/40) * 1</gadget>
<output>39/40 = around 0.975</output>

<result>39/40 = around 0.975</result>