On Sunday, Xiaoli's house had guests. In order to welcome the guests, her father asked Xiaoli to go to the market to buy fruits. There is a kind of banana called "millet banana" which sells for 19.6 yuan per kilogram. Xiaoli bought 2 kilograms in total. Xiaoli did the math, if she used the money to buy oranges, she could buy 5 kilograms. Do you know how much an orange costs per kilogram?
周日，小丽家来客人了，为了迎接客人，爸爸叫小丽到市场采购水果，有一种香蕉叫"小米蕉"每千克卖19.6元，小丽一共买了2千克．小丽算了一下，如果用这些钱买橙子，可买5千克．你知道每千克橙子多少钱吗？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">19.6 * (2/5)</gadget>
<output>7.84</output>

<result>7.84</result>