In order to green the environment, the students planted 250 trees, 4 of which died due to poor management. What is the survival rate of these trees?
为了绿化环境，同学们植树250棵，有4棵因管理不善死掉．这些树的成活率是多少？
<gadget id="calculator">250 - 4</gadget>
<output>246</output>

<gadget id="calculator">246 / 250</gadget>
<output>123/125 = around 0.984</output>

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

<gadget id="calculator">(123/125) * 1</gadget>
<output>123/125 = around 0.984</output>

<result>123/125 = around 0.984</result>