In the school tree planting activity, 200 trees were planted in the fifth grade, and 50 trees died. What is the survival rate?
在学校植树活动中，五年级栽了200棵，死了50棵，成活率是多少．
<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<gadget id="calculator">150 / 200</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) * 1</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>