Grandma Li bought 5.2 kilograms of eggplants at the vegetable market, paid 20 yuan, and got back 4.4 yuan. How much is a kilogram of eggplants?
李奶奶在菜市场买了5.2千克的茄子，付出20元，找回4.4元，每千克茄子多少元？
<gadget id="calculator">20 - 4.4</gadget>
<output>15.6</output>

<gadget id="calculator">15.6 / 5.2</gadget>
<output>3</output>

<result>3</result>