400 trees were planted in spring, 390 survived, what is the survival rate?
春季植树400棵，成活390棵，成活率是多少．
<gadget id="calculator">390 / 400</gadget>
<output>39/40 = around 0.975</output>

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

<gadget id="calculator">(39/40) * 1</gadget>
<output>39/40 = around 0.975</output>

<result>39/40 = around 0.975</result>