Depreciation as per income tax act.

Hello, If someone having 50,000/- as a opening block (01/04/2015) of assets of category 15% and sold something from it in exchange with Rs. 60,000/- on 03/10/2015 & having purchase worth Rs. 40,000/- as on 02/02/2016. Then how we will calculate depreciation as per Income Tax Act.....