The $125 is a fee that is not associated with hours worked. There is insufficient information in the problem statement to tell the reason for that fee, except that we know it is not the hourly charge. Perhaps the best assumption is that it is a flat fee.
The total of the prices of all of the baby shirts and sweaters that the store sold during the sale was $420.00. It's possible that 12 sweaters and 8 shirts are sold a bargen