The computer mall priced a computer at a profit of 20%, and then sold it at a 20% discount, resulting in a loss of 280 yuan. How much is the cost of this computer?
电脑商城将一款电脑按20%的利润定价，然后又打八折出售，则亏损了280元，这款电脑的成本是多少元？
<gadget id="calculator">1.2 * 0.8</gadget>
<output>0.96</output>

<gadget id="calculator">1 - 0.96</gadget>
<output>0.04</output>

<gadget id="calculator">280 / 0.04</gadget>
<output>7_000</output>

<result>7_000</result>