Grapes are 2.10 yuan/kg, bananas are 3.50 yuan/kg, peaches are 1.80 yuan/kg, and Aunt Li bought 2 kilograms of each of the three kinds of fruits. How much should I pay?
葡萄2.10元/千克，香蕉3.50元/千克，桃子1.80元/千克，三种水果，李阿姨各买了2千克，要付多少元？
<gadget id="calculator">2.1 + 3.5 + 1.8</gadget>
<output>7.4</output>

<gadget id="calculator">7.4 * 2</gadget>
<output>14.8</output>

<result>14.8</result>