Mom bought 6 kilograms of apples, 3.2 yuan per kilogram, and paid 20 yuan to the salesperson. How much should I get back?
妈妈买了6千克苹果，每千克3.2元，付给售货员20元，应找回多少元？
<gadget id="calculator">20 - 19.8</gadget>
<output>0.2</output>

<result>0.2</result>