Answer:
                          Debit         Credit
Salaries expense             $2,000
($400*5)
Salaries payable                           $2,000
Explanation:
The adjusting entry that shall be booked by the company in respect of salaries expense to be recorded in its accounts on December 31, 2010 is given below:
                          Debit         Credit
Salaries expense             $2,000
($400*5)
Salaries payable                           $2,000
Where the "5" represent the number of days from the December 27,2010 to the December 31,2010.