省到水電：Bal b/f TW$28,470+TW$365=TW$28,835 Bal c/f
https://youtu.be/HL_YOm4ziM8?si=utMEgurQmAkzbJOt
https://youtu.be/xehUWxVvlpU?si=3HsT9KI17bg0GNqv
https://youtu.be/cHpxp7-PwWo?si=cCqCKAjKR4gQm0Cx
https://youtu.be/PX1DVcd0qtM?si=RxaauK3ga7bM10m-