The Standard Variable Overhead Cost Rate for Walter Manufacturing Is

The standard variable overhead cost rate for Walter Manufacturing is $23 per unit.Budgeted fixed overhead cost is $52,000.Walter Manufacturing budgeted 4,000 units for the current period and actually produced 4,100 finished units.What is the production volume variance?
Assume the allocation base for fixed overhead costs is the number of units expected to be produced.

A) $2,300 favourable
B) $1,300 favourable
C) $2,300 unfavourable
D) $1,300 unfavourable