depr-do

in Depreciation:

I have calculate depreciation with 10% on asset(asset value 1,00,000) depreciation is (1,00,000*10/100)=10,000 this is january.(stright line method)

this is also february=10,000

Now in march I have posted in new depreciation rate@15% (include, january,and february) is possible or not ? if possible how? what about previous(janu+feb) depreciation. I want post the new depreciation is from january with new depreciation rate.

so plz clarrify me