There are about 2,500 species of fish in my country. Due to environmental pollution and other reasons, there are only about 2400 species left. About a few percent less than the original?
我国原有鱼类约2500种．由于环境污染等原因，现在只剩下约2400种．比原来大约减少了百分之几？
<gadget id="calculator">2_500 - 2_400</gadget>
<output>100</output>

<gadget id="calculator">100 / 2_500</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>