S. 55 : Capital gains – Cost of improvement – Cost of acquisition -Tenancy rights- Acquired tenancy rights by inheritance i.e. from his father before 1-4-1981, in view of provisions of section 49(1)(iii), benefit of indexation of cost of acquisition could not be granted while computing capital gain arising from sale of said rights- Cost to be taken as nil, as the assessee has not paid any purchase price for acquisition of the same . [ S. 48 ,49(1)(iii), 55 (2)(b), 55(3) ]