Rice is 3.20 yuan per kilogram, and rice cakes are 2.40 yuan per kilogram. If you buy 6 kilograms of rice and rice cakes each, how much should you get back after paying 50 yuan?
大米每千克3.20元，年糕每千克2.40元，买大米和年糕各6千克，付50元钱应找回多少元？
<gadget id="calculator">3.2 * 6</gadget>
<output>19.2</output>

<gadget id="calculator">2.4 * 6</gadget>
<output>14.4</output>

<gadget id="calculator">19.2 + 14.4</gadget>
<output>33.6</output>

<gadget id="calculator">50 - 33.6</gadget>
<output>16.4</output>

<result>16.4</result>