到底餐廳ge +1服務費係點計ge呢?

加10% 服務費
=$218+ $218x10%
= $218+$21.8
=$ 239.8

加1即係加10% of your total 食左幾多錢=)
例如食左45蚊要加一;
就即係45+4.5 = 49.5 [ 45 x (1+10%) ]

你話218;
就即係218+21.8 = 239.8