Solution:
Manufacturing overhead expense volatility will be determined by subtracting the overhead cost of output from the total overhead cost of production according to the adjustable budget.
(Manufacturing overhead cost as per flexible budget) =
(Actual units x Variable manufacturing overhead per unit +Fixed manufacturing overhead )
= (5,050 x $1.30)+ $41,500 = $48,065
Actual manufacturing overhead cost = $47,905
Therefore, Manufacturing overhead spending variance
= $48,065 - $47,905 = $160
The deviation is positive as the real expense is smaller than the adjustable cost of the program.