Learned counsel for the respondents submitted that at the relevant time the petitioner was to opt for payment of salary under the aforesaid scheme, as the petitioner was earlier governed under CDA pattern of pay. He had not opted at that time. Subsequently, the employees started raising grievance considering the fact that the pay under IDA pattern was more. The respondent-Corporation, as a policy matter, decided to give benefit to its employees. In terms thereof, pay of the petitioner has been refixed from 1.8.1983 onwards. The arrears were determined at 7,30,683/and after reducing the income-tax and certain amounts on account of vigilance recoveries etc., a sum of 6,01,121/- was paid to the petitioner in March, 2012.