S. 32 : Depreciation-Additional depreciation-Business of mining iron ore and sale thereof-Entitled to additional depreciation-Putting new assets to use for less than 180 days in previous year-Allowed 50 Per Cent. of eligible additional depreciation-Amendment allowing carry-over to subsequent year applicable prospectively from 1-4-2016-Not entitled to 50 Per Cent. of additional depreciation brought forward from earlier assessment year. [S. 32(i)(iia)]