Apples are 2.8 yuan per kilogram, and oranges are 2.2 yuan per kilogram. Xiaoxi bought 5 kilograms of apples and 5 kilograms of oranges for 30 yuan respectively. How much should I get back?
苹果每千克2.8元，橘子每千克2.2元，小西用30元分别买了5千克苹果和5千克橘子，应找回多少元？
<gadget id="calculator">2.8 * 5</gadget>
<output>14</output>

<gadget id="calculator">2.2 * 5</gadget>
<output>11</output>

<gadget id="calculator">14 + 11</gadget>
<output>25</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>