The sixth grade participated in the activity of "Strive to be a garden guard". A total of 400 trees were planted, and 10 trees died. What is the survival rate?
六年级参加"争做园林卫士"活动，共植树400棵，死了10棵，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>