Answer
The South's budget was under budgeted by $63,900
Step-by-step explanation
The sum of the north and south division equals that of the entire Company.
Company's budget = North + South budget
Let us represent the value of the south budget by y
(59,700) = 4,200 + y
y = -59,700 - 4200
y = 63,900
The South's budget was under budgeted by $63,900