person bought a batch of river crabs at a price of 5,000 yuan, but for some reason only sold them for 4,500 yuan, what is his loss rate on this business?
某人以5000元的价格买入了一批河蟹，因某种原因只卖了4500元，则他这笔生意的亏损率为多少．
<gadget id="calculator">5_000 - 4_500</gadget>
<output>500</output>

<gadget id="calculator">500 / 5_000</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>