Mom bought 6 kilograms of green apples in the supermarket, paid 50 yuan, and got back 21.2 yuan. How much is each kilogram of green apples?
妈妈在超市买了6千克青苹果，付出50元，找回21.2元，每千克青苹果多少元？
<gadget id="calculator">50 - 21.2</gadget>
<output>28.8</output>

<gadget id="calculator">28.8 / 6</gadget>
<output>4.8</output>

<result>4.8</result>