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The fixed factory overhead volume variance is $400 (unfavorable)
solution
Fixed Overhead Volume Variance = Applied Fixed Overhead – Budgeted Fixed Overhead
Applied Fixed Overhead
= 4,000 units ×2.5 hrs per unit×$0.80 = $8000
and
Budgeted Fixed Overhead =10,500 hrs × $0.80 = $8400

Fixed Overhead Volume Variance = $8000- $8400 = $400 (unfavorable)

Industrialized former colonial states that dominate the world economic system: Core Countries
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