Xiaohua bought 8.5 kilograms of beans at the vegetable market, paid the salesperson 13 yuan, and got back 0.25 yuan. How much is it per kilogram of beans?
小华在菜场买了8.5千克豆角，付给售货员13元后，找回0.25元．每千克豆角多少元？
<gadget id="calculator">13 - 0.25</gadget>
<output>12.75</output>

<gadget id="calculator">12.75 / 8.5</gadget>
<output>1.5</output>

<result>1.5</result>