Uncle Li bought 3 kilograms of oranges and 4 kilograms of apples in Limin Supermarket and spent a total of 28.6 yuan. It is known that the unit price of oranges is 3.2 yuan/kg. How much is an apple per kilogram?
李叔叔在利民超市购买了3千克桔子和4千克苹果一共用了28.6元．已知桔子的单价是3.2元/千克．苹果每千克多少元？
<gadget id="calculator">3 * 3.2</gadget>
<output>9.6</output>

<gadget id="calculator">28.6 - 9.6</gadget>
<output>19</output>

<gadget id="calculator">19 / 4</gadget>
<output>19/4 = around 4.75</output>

<result>19/4 = around 4.75</result>