Computer worth P30 000 was acquired June 25, 2011 estimated life is 5 years. Make an adjustment as of December 31, 2011.

You need to do an adjusting entry for the depreciation on the computer. You know the cost of the computer when purchased and the estimated life of the computer. You still need to know the depreciation method to use i.e. straight-line, double-declining balance, sum of the year digits, etc... Also you should know the salvage value.

When you calculate your depreciation you will need to calculate for 6 months of the year.

Your adjusting entry will be:
Debit Depreciaiton Expense for the amount of depreciation
Credit Accumulated Depreciation - Computer for the amount of depreciation