El encashment

Dear All

I am working in chennai. I joined this company on 01-10-2013 with a basic salary of Rs. "X" and  received and increment of Rs. "X+1" = "Y" (Current basic) on 10-08-2015. Now I am planning to resign this month.

Now my query is how will be my EL encahsment calculated. Will it be calculated oas below (Options)

1) For Ex : X/26 Days * No of EL Balance

or

2) Y/26 Days * No of EL Balance

or

3) X/26 * No of EL balance(EL till 1st basic salary) + Y/26*No of EL Balance( EL from salay revision)

Thanks in advance