A box of apples is sold at 1.6 yuan per kilogram, and the loss is 10 yuan; sold at 2.2 yuan per kilogram, the profit is 5 yuan. If you want to make no loss and no profit, how much should you sell per kilogram?
一箱苹果，按每千克1.6元卖，亏10元；按每千克2.2元卖，赚5元．要想不亏不赚，每千克应卖多少元．
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">2.2 - 1.6</gadget>
<output>0.6</output>

<gadget id="calculator">15 / 0.6</gadget>
<output>25</output>

<gadget id="calculator">25 * 1.6</gadget>
<output>40</output>

<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">50 / 25</gadget>
<output>2</output>

<result>2</result>