说明：  出租车计费系统的设计 （1）车起步开始计费 （2）车行驶超过3 km后,按每公里2.2元计费 （3）行驶路程达到或超过9 km后(车费达到20元)，每公里加收50％的车费,
(Taxi Accounting System Design (1) cars began to start billing (2) The car traveled over 3 km, after 2.2 kilometers per billing (3) of distance traveled and met or exceeded 9 km after (fares up to 20 million) per kilometer additional 50 of the fare,)