The school planted 400 trees this spring, and 4 died. What is the survival rate?
学校今春植树400棵，枯死4棵，成活率是多少．
<gadget id="calculator">400 - 4</gadget>
<output>396</output>

<gadget id="calculator">396 / 400</gadget>
<output>99/100 = around 0.99</output>

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

<gadget id="calculator">(99/100) * 1</gadget>
<output>99/100 = around 0.99</output>

<result>99/100 = around 0.99</result>