How much is the standard income tax deduction?

answer: 1.income from salary is less than is rs.1.5 lacks ----40% of gross salary or 30000/- which ever is lower.
2.income from salary exceeds rs. 1.5 lacks but does not exceeds rs. 5 lacks --- rs.30000/-
3.income from salary exceeds rs. 5 lacks ---- rs. 20000/-