V/M應該係一日一個rate嘅,我條數冇咁複雜
扣數就冇乜懸念,用番Visa 24/Mar個rate,入番啲data就得
Statement:ex. rate 0.05279 / HKD200.60
Visa website:3800 JPY = 200.597708 HKD
% Mark-up over European Central Bank Rate = 2.12
1 JPY = 0.052789 HKD
1 HKD = 18.943386 JPY
但退款就......條數完全計唔番,大貓食水很深
Statement:ex. rate 0.0549 / HKD191.88