If the purchase price of a piece of clothing is 80 yuan and the selling price is 100 yuan, what is its profit rate?
批一件服装的进价为80元，售价为100元，则它的盈利率为多少．
<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<gadget id="calculator">20 / 80</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>