on 8-39 part g asks for production volume variance. how do i solve for that?

Input 5 lb. at $4 per lb. Cost per Output Unit $20.00 Direct materials Direct manufacturing labor Manufacturing overhead 64.00 Variable Fixed S8 per DLH S9 per DLH 32.00 36.00 S152.00 Standard manufacturing cost per output unit Direct materials purchased Direct materials used Direct manufacturing labor Total actual manufacturing overhead (variable and fixed) Actual production 40,300 lb. at $3.80 per lb. 37300 lb. 31,400 hrs. at $16.25 per hr. 7600 output units