(b)in a case where any tangible asset [as referred to in section 33(12)(a)(i)], which is owned by assessee, is sold, discarded, demolished or destroyed, and the moneys payable for such asset, together with the scrap value [A] exceeds the written down value of such assets [C], the sum as computed below, in the tax year in which the moneys payable for such asset becomes due––(i)where the moneys payable for such asset together with the scrap value [A] is less than the actual cost of such asset [B], then—[A] – [C]; or(ii)in any other case,—[B] – [C];