certain commodity is sold at a fixed price, and each can make a profit of 12 yuan. If 10 units are sold at 80% of the price, the profit obtained from selling 12 units at a price reduction of 10 yuan each is as much. What is the original purchase price of each unit of this commodity?
某商品按定价出售，每个可获利12元．如果按定价的80%出售10件，与按定价每个减价10元出售12件所获得利润一样多，这种商品每件原进价为多少元．
<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12 * (1/5)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">12 - (12/5)</gadget>
<output>48/5 = around 9.6</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(48/5) / (1/5)</gadget>
<output>48</output>

<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<result>36</result>