What is the ideal package of C3B to join TCS with 12 years exp ??

50-60 lpa would be ideal but you will get lower than market standards though

I would say 1 cr fixed

Minimum 30

There is no ideal package at TCS. If you are joining the TCS, try to get more package and most importantly negotiate on hand salary and try to reduce variable pay. Another consideration to make is no market standard increment here.

So make your move wisely.