The green team participated in the tree planting activity and planted a total of 400 trees, 50 of which did not survive. What is the survival rate of these trees?
绿色小队参加植树活动，共植树400棵，有50棵没有成活，这批树的成活率是多少？
<gadget id="calculator">400 - 50</gadget>
<output>350</output>

<gadget id="calculator">350 / 400</gadget>
<output>7/8 = around 0.875</output>

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

<gadget id="calculator">(7/8) * 1</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>