For a commodity, if the purchase price is reduced by 10% and the selling price remains the same, then the gross profit rate (gross profit rate=((selling price-purchase price)/(purchase price))*100%) can increase by 12%. What is the gross profit margin on merchandise sold.
某种商品，如果进价降低10%，售价不变，那么毛利率(毛利率=((售价-进价)/(进价))*100%)可增加12%，则原来这种商品售出的毛利率是多少．
<gadget id="calculator">27 / 25</gadget>
<output>27/25 = around 1.08</output>

<gadget id="calculator">(27/25) - 1</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">(2/25) / 1</gadget>
<output>2/25 = around 0.08</output>

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

<gadget id="calculator">(2/25) * 1</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>