已結業公司單據價值 | 未完成的療程價值 | a3醫學抗衰老中心的優惠 |
HK$10,000 | HK$5,000 | HK$5,000 |
| 姊妹需付出的價值 | 扣減的優惠價值 | $5,000 |
| Facial A (原價$1,000) | 半價$500 | $5,000-$500 | =$4,500 |
| Facial B (原價$1,200) | 半價$600 | $4,500-$600 | =$3,900 |
| Facial C (原價$600) | 半價$300 | $3,900-$300 | =$3,600 |
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