Query regarding depreciation as per it act

I am handling a project in which following abstract of data is and my query is regarding DEPRECIATION as per INCOME TAX 

wdv of block of plant and machinery say- 2000 cr

Purchase during the year - 5000 cr (less than 182 days)

and Machinery sold during the year - 2500 cr

i am calculating depreciation as given below :-

                  WDV -                    2000

add:- Purchase-                  5000

less :- money payble :-       2500

wdv on dep to be calculated :-   4500 @ 7.5%(as asset purchase is less than 182 days)

Depreciation for the period = 337.5 cr

is this right Treatment as per INCOME TAX ACT. ???????

plz suggest me the absolute solution.............thx in advance ....