A profit of 6 yuan can be obtained by selling an item at the fixed price. The profit obtained by selling 15 units at 80% of the price is equal to the profit obtained by selling 10 units at a discount of 2.4 yuan each from the original price. What is the cost price of each item? ．
某物品按定价出售可获6元利润，现按定价的80%出售15个所获得利润与按原价每个减价2.4元出售10个所获利润相等，那么每个物品的成本价是多少元．
<gadget id="calculator">6 - 2.4</gadget>
<output>3.6</output>

<gadget id="calculator">3.6 / 15</gadget>
<output>0.24</output>

<gadget id="calculator">10 * 0.24</gadget>
<output>2.4</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">3.6 / (1/5)</gadget>
<output>18</output>

<gadget id="calculator">18 - 6</gadget>
<output>12</output>

<result>12</result>