20 April 2015
In Schedule II useful life is given.
WDV rates are determined using mathematical formula in such a way that at the end of the usefull life of the Assets, after charging depreciation under WDV, residual value will be same as under SLM method. You charge depreciation under any method the residual value at the end of useful life will be same under both.
You can try calculating WDV rate yourself using below formula:
r = 1-(s/c)^(1/n)
Where,
r = rate of depreciation s = scrap value c = cost of assets n = no. of year of life of assets
20 April 2015
Also check out Application Guide on the provisions of Schedule II to the Companies Act 2013 by Corporate Laws & Corporate Governance Committee of ICAI from link given below: