am a senior citizen, aged 63 yrs, i have a minimum income of rs 50000 per annum from A.Y 1994-1995 SO i am not submitted any income tax return from 1995-1996 and having a piece of land which is for residential house purpose but it is still empty, i sale this on jan 2012worth r.s. Ten lakh the cost of acquisition is r.s. 7500 in 1994, please tell me what is LTCG on this while it is empty land, and if i invest rs 1000000 in 54ec bond then it is compulsary to submit income tax return ? and what is my tax liabilities?