Finding variable manufacturing overhead variances

Acme Widgets allocates VMOH based on $MH$ :

v$.$ POHR for VMOH$=$$$\frac{6}{M}H$

vi$.$ Standard for $MH=4MH$ per widget

vii. Actual VMOH costs $=$$$7,540$

viii. Actual usage $=1,300MH$

A$.$ VMOH spending variance $=|$

Possible causes:

B$.$ VMOH efficiency variance $=$

Possible causes:

C$.$ Total VMOH variance $=$

Finding fixed manufacturing overhead variances

Acme Widgets also allocates FMOH based on $MH$ :

i$.$ POHR for FMOH$=$$$\frac{20}{M}H$

ii$.$ Standard for $MH=4MH$ per widget

iii. Actual FMOH costs $=$$$20,500$

iv$.$ Actual usage $=1,300MH$

A$.$ FMOH spending variance :

Possible causes:

B$.$ FMOH volume variance $=$

Possible causes:

C$.$ Total FMOH variance $=$