I need to know how to calculate this in my systems understanding aid project

b. Depreciation Expense. Depreciation expense is calculated once annually at the end of each year and recorded in the general journal as of December 31. The depreciation methods, estimated lives, and salvage values are documented in the fixed asset subsidiary ledger. Depreciation in the year of sale or acquisition is calculated following a half year convention, which means that six months of depreciation is taken regardless of the amount of time the assets were actually owned during these years. b. Depreciation Expense. Depreciation expense is calculated once annually at the end of each year and recorded in the general journal as of December 31. The depreciation methods, estimated lives, and salvage values are documented in the fixed asset subsidiary ledger. Depreciation in the year of sale or acquisition is calculated following a half year convention, which means that six months of depreciation is taken regardless of the amount of time the assets were actually owned during these years