If the purchase price of a piece of clothing is 120 yuan and the selling price is 150 yuan, what is its profit rate?
批一件服装的进价为120元，售价为150元，则它的盈利率为多少．
<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>