Students in grade six planted 78 trees and survived, and 2 trees did not survive. What is the survival rate?
六年级同学植树成活78棵，未成活2棵，成活率是多少．
<gadget id="calculator">78 + 2</gadget>
<output>80</output>

<gadget id="calculator">78 / 80</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>