Final answer:
The net loss for Macy is $200.
Step-by-step explanation:
To calculate the net loss for Macy, we need to determine the difference between the amount of the returned units and the cost of those units. In this case, Macy returns 50 units with an invoice amount of $650. The cost of those units is $450. Therefore, the net loss for Macy is $650 - $450 = $200.