Kindly Give me the answer of the following question:
It relates to salary head of income tax act.
A person who does not entitled to gratuity, commutes his pension in past with 30%. Now he wants to commute again with 25% of its total pension in the previous year he shall be allower exemption to the extent of ____?
option is 1) Nil 2) 25% 3) 20%
a right ans is 20%. If any one knows the logic behind it kindly give comments on it.