A kind of fruit is 2.8 yuan per kilogram, and the mother brings 10 yuan to buy 3 kilograms of this kind of fruit, how much should I get back?
一种水果每千克2.8元，妈妈带10元钱买3千克这样的水果，应找回多少元？
<gadget id="calculator">2.8 * 3</gadget>
<output>8.4</output>

<gadget id="calculator">10 - 8.4</gadget>
<output>1.6</output>

<result>1.6</result>