Answer:
The adjusting entries should be:
December 31, adjusting entry Shimeca Company
Dr Cost of goods sold 2,150
Cr Manufacturing overhead costs 2,150
December 31, adjusting entry Garcia Company
Dr Manufacturing overhead costs 997
Cr Cost of goods sold 997
Both accounts (manufacturing overhead and cogs) are expense accounts that have debit balances, but manufacturing overhead is included under cogs and has to be closed against it at the end of the year.