https://www.singpao.com.hk/mobile/index.php?fi=news1&id=115650
省到水電：Bal b/f TW$20,805+TW$365=TW$21,170 Bal c/f
https://ctinews.com/news/items/m0x7rl6kav
Bal b/f 417 Tempos+2 Tempos=417 Tempos Bal c/f
https://www.hkcd.com/content/2020-09/02/content_1211992.html