https://youtu.be/STq-2rFZ508?si=njsDP5dszIHgamZ2
https://youtu.be/nNxJjKGg3vw?si=mVuEDh_-jlx7AfPB
省到水電：Bal b/f TW$28,470+TW$365=TW$28,835 Bal c/f
https://youtu.be/K-dsxIsKo6o?si=p0c5hKAkP0tajGui
https://youtu.be/w1339YccakA?si=ESvltb6UtVC3H2al