There are about 4,000 species of mammals in the world, among which there are about 500 species in my country. How many percent of the mammals in my country account for the world?
全世界哺乳类动物约有4000种，其中我国约有500种，我国哺乳类动物占全世界的百分之几？
<gadget id="calculator">500 / 4_000</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>