This is all depends on the company policy.
As I am sharing you my company practice hope that may help you.
BASIC - 50% OF CTC
HRA - 50% OF Basic
TA - 1600 MAX
MEDICAL - 1250
LTA - 8.33% OF BASIC
BONUS - 8.33% OF BASIC
C.E.A. - 200
SPACIAL ALLOWANCE - BALANCE FIGURE
6th October 2016 From India, Alwar