shopping mall buys a batch of trousers at a wholesale price of 50 yuan each, and sells them at a price of 80 yuan each. What is the profit rate of the shopping mall selling a pair of trousers?
某商场以每条50元的批发价购进一批裤子，以每条80元的价格售出，则商场卖出一条裤子的盈利率=多少．
<gadget id="calculator">80 - 50</gadget>
<output>30</output>

<gadget id="calculator">30 / 50</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>