A long-distance bus starts from Station A, ends at Station C, and stops at Station B on the way. The fare from Station A to Station B and from Station B to Station C is 2 yuan, while the fare from Station A to Station C is 3 yuan. A certain bus carries 16 passengers when it leaves station A, and when it arrives at station B, 9 people get off and 8 people get on the bus, so how much is the ticket revenue of the long-distance bus for this trip?
一辆长途汽车起点是甲站，终点是丙站，中途停靠乙站．从甲站到乙站和从乙站到丙站的票价都是2元，而从甲站到丙站的票价是3元．某辆汽车离开甲站时载有16名乘客，到了乙站有9人下车，8人上车，那么该长途汽车这一趟的车票收入是多少元．
<gadget id="calculator">2 * 9</gadget>
<output>18</output>

<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<gadget id="calculator">3 * 7</gadget>
<output>21</output>

<gadget id="calculator">18 + 16 + 21</gadget>
<output>55</output>

<result>55</result>