In a certain city, taxis charge 8 yuan within 3 kilometers, and an additional 1.8 yuan for every additional kilometer thereafter. Uncle Li is 9 kilometers away from his home to the train station. How much should he pay by taxi?
某市出租车规定3公里以内收费8元，之后每超出一公里多收1.8元．李叔叔从家到火车站有9公里，坐出租车应付多少元？
<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">1.8 * 6</gadget>
<output>10.8</output>

<gadget id="calculator">10.8 + 8</gadget>
<output>18.8</output>

<result>18.8</result>