July $31$ Admin. sal.

July $31$ Supplies

July $31$ Prof. sal.

July $31$ Billed

July $31$ Cost

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b$.$ How much office overhead is over$-$ or underapplied? Enter your answer as a positive number.

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c$.$ Determine the gross profit on the Obsidian case, assuming that over$-$ or underapplied office overhead is closed monthly to cost of services.

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