Taxi charges in a certain city: within 3km, the starting fare is 8 yuan; for more than 3km, the excess part is within 4km, 1.4 yuan per kilometer; for the part exceeding 4km, 2.1 yuan per kilometer. Uncle Wang drove 11km by taxi one time, how much should he pay for the fare?
某市出租车收费规定：3km以内为起步价8元；超过3km的，超过部分在4km以内，每千米1.4元；超过4km的部分每千米2.1元．王叔叔某次乘出租车行驶了11km，应付多少元车费？
<gadget id="calculator">1.4 * 4</gadget>
<output>5.6</output>

<gadget id="calculator">11 - 3 - 4</gadget>
<output>4</output>

<gadget id="calculator">2.1 * 4</gadget>
<output>8.4</output>

<gadget id="calculator">8 + 5.6 + 8.4</gadget>
<output>22</output>

<result>22</result>