Commuted Pension

Ashish (CHARTERED ACCOUNTANTS) (26 Points)

03 October 2010  

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.