Spending amount (A) | Number of DBS$ used (B) | Converted at DBS$1 = HK$1.25 to set off the spending amount (C) (C = B ×1.25) | Amount payable after set off (D) (D = A – C) | |
Example 1 | HK$180 | DBS$144 | HK$180 | HK$0 |
Example 2 | HK$180 | DBS$53 | HK$66.25 | HK$113.75 |
Example 3 | HK$83.90 | DBS$67 | HK$83.75 | HK$0.15 |