1) Basic pay on date of retirement on 30.06.2004: 7850/-
2) Notional pay fixed on 1.1.2006: 7850 x 1.86 = 14610/-
3) Adding appropriate GP: 14610 + 4200 = 18810/-
4) Notional pay fixed on 1.1.2016: 18810 x 2.57 = 48341.70
5) Notional pay as per Pay Matrix of 7th CPC at Level 6: 49000/-
6) Revised pension from 1.1.2016: 24500/-
7) Basic Pension originally fixed under Option 2 from 1.1.2016: 22581/-
8) Difference in Pension (between column 6 - 7): 1919/-
9) Arrears due from 1.1.2016 to 30.04.2017 for 16 months:
1919 x 16 = 30704/- + DR due from 1.7.2016 (228/-) and 1.1.2017 (462/-) = 690/-;
So total arrears = 30704 + 690 = 31304/-.