During the tree planting activity, a total of 200 trees were planted, and 180 survived. What is the survival rate?
植树活动中，共植了200棵，成活了180棵，成活率是多少．
<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>