楼主:
yuenru (有挑戰很好呀)
2019-04-20 11:27:53https://i.imgur.com/nJNEa1q.png
相当于40杯支付30杯的钱，3/4=0.75
供参考。
https://event-web.line.me/ectw/publication/f3d5334741edb9c6806cb3651dc61d3cbfa9123c141abd5a2b4cc35c4911c139?utm_source=OA&utm_medium=pay&utm_campaign=20190410_citycafe%EF%BB%BF
(抱歉未缩址)