# Simple Example

In this example, 69 units were sold from FBA in the past 30 days. Because it is based on a 30-day period, the per-day velocity is 2.3.

- **Deficit 15**— Multiplying 2.3 by 15 = 34.5. Subtract the FBA Qty, the Unshipped Qty, and the In Transit Qty. This gives you a Deficit 15 of 0.

**((69/30) * 15) – (12 + 29 + 21) = – 27.5**. Therefore, there is no deficit quantity.
- **Deficit 30**— Multiplying 2.3 by 30 = 69. Subtract the FBA Qty, the Unshipped Qty, and the In Transit Qty. This gives you a Deficit 30 of 7.

**((69/30) * 30) – (12 + 29 + 21) = 7**
- **Deficit 60**— Multiplying 2.3 by 60 = 138. Subtract the FBA Qty, the Unshipped Qty, and the In Transit Qty. This gives you a Deficit 60 of 76.

**((69/30) * 60) – (12 + 29 + 21) = 76**
- **Same calculation for 45 and 90**
- Since Days To Order 60 was selected, the deficit qty of 76 is auto-entered into the **Qty** field to add to an FBA Inbound Shipment.