Of the 450 trees planted, 9 did not survive. What is the survival rate?
种树450棵有9棵没活，成活率多少．
<gadget id="calculator">450 - 9</gadget>
<output>441</output>

<gadget id="calculator">441 / 450</gadget>
<output>49/50 = around 0.98</output>

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

<gadget id="calculator">(49/50) * 1</gadget>
<output>49/50 = around 0.98</output>

<result>49/50 = around 0.98</result>