Given:
First 2 days the salesperson sold an average of $44531 cars.
For next 11 days she sold an average of $50063 cars.
To find the sell on average per day over the entire time,
The total cost is,

The total number of days she work is 2+11=13.
So, the average cost per day is,

Answer: the average cost per day over entire time salesperson worked is $49211.92