Mom gave Xiaoyong 19.2 yuan to buy 2.5 kilograms of bananas and 2 kilograms of oranges, and the money was just spent. But Xiaoyong reversed the quantity he bought, and the result was 0.6 yuan left. How much is an orange per kilogram.
妈妈给小勇19.2元，让他去买2.5千克香蕉和2千克桔子，钱正好花完．可小勇把买的数量弄颠倒了，结果剩下了0.6元．每千克桔子多少元．
<gadget id="calculator">19.2 - 0.6</gadget>
<output>18.6</output>

<gadget id="calculator">18.6 * 2.5</gadget>
<output>46.5</output>

<gadget id="calculator">19.2 * 2</gadget>
<output>38.4</output>

<gadget id="calculator">46.5 - 38.4</gadget>
<output>8.1</output>

<gadget id="calculator">6.25 - 4</gadget>
<output>2.25</output>

<gadget id="calculator">8.1 / 2.25</gadget>
<output>3.6</output>

<result>3.6</result>