Xiaoxiao bought 1.6 kilograms of dragon fruit, gave 20 yuan to the salesperson's aunt, and got back 3.2 yuan. How much does dragon fruit cost per kilogram?
笑笑买了1.6千克火龙果，给售货员阿姨20元钱，找回3.2元．火龙果每千克要多少钱？
<gadget id="calculator">20 - 3.2</gadget>
<output>16.8</output>

<gadget id="calculator">16.8 / 1.6</gadget>
<output>10.5</output>

<result>10.5</result>