Mom bought 8.5kg of oranges, gave the salesperson 50 yuan, and got back 9.2 yuan. How much is it per kilogram of oranges?
妈妈买了8.5kg桔子，给售货员50元，找回9.2元．每千克桔子多少元？
<gadget id="calculator">50 - 9.2</gadget>
<output>40.8</output>

<gadget id="calculator">40.8 / 8.5</gadget>
<output>4.8</output>

<result>4.8</result>