Mom bought a watermelon weighing 4.5 kilograms and paid a total of 10.8 yuan. How much is the average watermelon per kilogram?
妈妈买了一个重4.5千克的西瓜，共付了10.8元钱，平均每千克西瓜多少元？
<gadget id="calculator">10.8 / 4.5</gadget>
<output>2.4</output>

<result>2.4</result>