A GROUP D EMPLOYEE (DARWAN) JOINED ON 04/11/1989.
ON 03/11/1999, HE IS GIVEN FIRST HIGHER SCALE ON COMPLETION OF 10 YEARS.
ON 03/11/2005, HE IS GIVEN 2ND HIGHER SCALE ON COMPLETION OF 16 YEARS.
ON 27/12/2010, HE PROMOTED TO CASH SARKAR POST WITH GRADE PAY ENHANCEMENT FROM 1800 TO 1900.
ON 03/11/2014, HE IS GIVEN 25 YEARS CAS BENEFIT .
i just want know in which circumstances, this may happen. Provided he is given promotion, should he be entitled to CAS benefit of 25 yeras