The starting price of a taxi in a city is 8 yuan for 3 kilometers, and the fare will increase by 2 yuan for every additional kilometer in the future. Xiaoya needs to pay 30 yuan for a taxi from home to the Children’s Palace. Xiaoya plans to spend 2 yuan to take the bus first. How much can you save by taking a taxi for half the distance by car and the remaining half? (waiting fee not included)
某城市出租车起步价为3千米8元，以后每增加1千米车费增加2元，小亚从家到少年宫，出租车费需付30元，小亚打算先花2元钱乘公交车行一半路程，剩下的一半路程乘出租车，这样可以比原来节省车费多少元？(不计等候费)
<gadget id="calculator">30 - 8</gadget>
<output>22</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<gadget id="calculator">11 + 3</gadget>
<output>14</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 8 + 2</gadget>
<output>18</output>

<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<result>12</result>