sporting goods store has bought a batch of basketballs, which are divided into first-class and second-class basketballs. The purchase price of the second-best product is 20% cheaper than that of the first-best product. According to the principle of higher quality and better price, the first-best product is priced at 20% profit, and the second-best product is priced at 15% profit. The first-class basketball is 14 yuan more expensive than the second-class basketball. Q: How much is the purchase price of each top-quality basketball?
某体育用品商店进了一批篮球，分一极品和二极品．二极品的进价比一极品便宜20%，按优质优价的原则，一极品按20%的利润定价，二极品按15%的利润定价．一极品篮球比二极品篮球每个贵14元．问一极品篮球的进价是每个多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/5) * (3/20)</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">(3/100) - 1 - (3/20)</gadget>
<output>-28/25 = around -1.12</output>

<gadget id="calculator">1 + (1/5) + (1/5) + (-28/25)</gadget>
<output>7/25 = around 0.28</output>

<gadget id="calculator">14 / (7/25)</gadget>
<output>50</output>

<result>50</result>