Nanchang taxi is 5 yuan within 3km, 1.8 yuan per kilometer over 3km (less than 1km is calculated as 1km, Uncle Li took a taxi for 18.4km, how much does he have to pay in total.
南昌出租车3km内5元，超过3km每千米1.8元(不足1km按1km计算，李叔叔坐出租车行驶了18.4km，他一共要付多少钱车费．
<gadget id="calculator">16 * 1.8</gadget>
<output>28.8</output>

<gadget id="calculator">5 + 28.8</gadget>
<output>33.8</output>

<result>33.8</result>