Excess from the replaced item (Item 1): NT 180 – 170 = NT 10 / 20 = $0.50
Shipping Charges for Batch 3: $8.40
Additional new item: NT 220 / 20 = $11.00
Amount to be transferred: $8.40 – 0.50 + 11.00= $18.90
Pls confirm if it’s correct.
Will transfer the amount tonight.