Class 61 students planted a total of 400 trees on Arbor Day, and 398 survived. What is the survival rate?
六1班同学植树节共植树400棵，成活398棵，成活率是多少？
<gadget id="calculator">398 / 400</gadget>
<output>199/200 = around 0.995</output>

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

<gadget id="calculator">(199/200) * 1</gadget>
<output>199/200 = around 0.995</output>

<result>199/200 = around 0.995</result>