On Arbor Day, our school planted 192 trees, 172 of which survived, and later replanted 8 of them all survived. What is the survival rate of trees planted on Arbor Day?
植树节，我校种了192棵树，种活172棵，后来又补种8棵全部成活．植树节种树的成活率达多少．
<gadget id="calculator">172 + 8</gadget>
<output>180</output>

<gadget id="calculator">192 + 8</gadget>
<output>200</output>

<gadget id="calculator">180 / 200</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>