Mom bought 2.5 kilograms of cucumbers at the supermarket, handed them to the salesperson for 10 yuan, and got back 2 yuan. How much is it per kilogram of cucumbers?
妈妈到超市买了2.5千克黄瓜，交给售货员10元，找回2元，每千克黄瓜多少元？
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 2.5</gadget>
<output>3.2</output>

<result>3.2</result>