The price of selling 13 pieces of a certain commodity at a profit of 7 yuan is the same as the price of selling 12 pieces at a profit of 23 yuan per two. What is the purchase price of this commodity?
某种商品按每个7元的利润卖出13个的钱与按每两个23元的利润卖出12个的钱一样多，这个商品的进价是每个多少元？
<gadget id="calculator">23 / 2</gadget>
<output>23/2 = around 11.5</output>

<gadget id="calculator">(23/2) * 12</gadget>
<output>138</output>

<gadget id="calculator">7 * 13</gadget>
<output>91</output>

<gadget id="calculator">138 - 91</gadget>
<output>47</output>

<gadget id="calculator">13 - 12</gadget>
<output>1</output>

<gadget id="calculator">47 / 1</gadget>
<output>47</output>

<result>47</result>