Grandpa Li bought 2.8 kilograms of beans in the supermarket, paid 10 yuan, got back 4.4 yuan, how much is it per kilogram of beans?
李爷爷在超市买了2.8千克豆角，付出10元，找回4.4元，每千克豆角多少元？
<gadget id="calculator">10 - 4.4</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 / 2.8</gadget>
<output>2</output>

<result>2</result>