省到水電:Bal b/f TW$28,105+TW$365=TW$28,470 Bal c/f
https://youtu.be/SmqZzbiHqFc?si=Fmi1XhjfuqCf6-Ib
https://youtu.be/2uXLCuG1nd8?si=6NgyGgmbCrMCTgVy
https://digitalrepository.lib.hku.hk/catalog/2f75xg03r#?c=&m=&s=&cv=&xywh=-1646%2C-2069%2C4369%2C7169
https://youtu.be/Aw7AG7YCJfY?si=DjD3KlDlJeiA720U