For a commodity, the purchase price of supermarket A is 10% cheaper than that of store B. Supermarket A sets the price at 20% profit, and store B sets the price at 15% profit. As a result, the price of supermarket A is 0.14 yuan cheaper than that of store B. So how much is the purchase price of store B?
一种商品，甲超市比乙商店进价便宜10%，甲超市按20%的利润定价，乙商店按15%的利润定价，结果甲超市的定价比乙商店的定价便宜0.14元．那么乙商店的进价是多少元．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/10) * (1/5)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/50) - 1 - (1/5)</gadget>
<output>-59/50 = around -1.18</output>

<gadget id="calculator">1 + (3/20) + (1/10) + (-59/50)</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">0.14 / (7/100)</gadget>
<output>2</output>

<result>2</result>