28,725KM-160KM=28,565KM
省到累積：Bal b/f TW$0+早餐TW$40+午餐+TW$46+晚餐TW$60+不買茶啡TW$0=TW$146 Bal c/f
28,831KM-6KM=28,825KM
28,825KM-100KM=28,725KM
https://www.am730.com.hk/column/%E8%B2%A1%E7%B6%93/%E7%B7%AC%E7%94%B8%E6%9C%80%E6%96%B0%E5%B1%80%E5%8B%A2/501327