Tax Depreciation

Hi Experts,

i have a requirement in asset accounting.

1. ASSET VALUE 2 QTY = 100

book depreciation tax depreciation

10 15

Net block of asset after depreciation is

90 85

asset value q1 is

45 43

sold out qty 1 for Rs.35

35 35

profit & loss 10 ?

Net Block 45 50

this will affect normal accounting processing. if i use tax depreciation is it calculate like this in SAP

How system take tax deprecation and how it will calculate at the time of selling the asset.

Please clarify my doubt.

Thanks

Raj..