Xiaohong's mother went to the fruit shop and bought 2 kilograms of apples and 2 kilograms of pears, and the total cost was 10.4 yuan. Pears are 2.8 yuan per kilogram, how much are apples per kilogram?
小红的妈妈到水果店买了苹果和梨各2千克，共用了10.4元．梨每千克2.8元，苹果每千克多少元？
<gadget id="calculator">2.8 * 2</gadget>
<output>5.6</output>

<gadget id="calculator">10.4 - 5.6</gadget>
<output>4.8</output>

<gadget id="calculator">4.8 / 2</gadget>
<output>2.4</output>

<result>2.4</result>