Uncle Wang went to the supermarket to buy 8 kilograms of rice, paid the salesperson 30 yuan, got back 4.4 yuan, how much is it per kilogram of rice?
王叔叔去超市买了8千克大米，付给售货员30元，找回4.4元，每千克大米多少元？
<gadget id="calculator">30 - 4.4</gadget>
<output>25.6</output>

<gadget id="calculator">25.6 / 8</gadget>
<output>3.2</output>

<result>3.2</result>