On Arbor Day, the sixth graders planted 10 trees, and one of them failed to survive. What is the survival rate?
植树节，六年级学生植了10棵树，有1棵未成活，成活率是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>