https://youtu.be/GWnCylRSwSA?si=eKQfKegrw76g5O8P
https://youtu.be/kZAEu66oTpM?si=w3xE0_DlB0loMv0t
省到水電：Bal b/f TW$25,550+TW$365=TW$25,915 Bal c/f
https://youtu.be/flwbax4HpI0?si=jwt0NtUq8cbUr-uz
