Hello Rini,
I am with (Cite Contribution) & Ankita Shah that one learns ONLY by asking/enquiring. there's no other way out--for anyone & everyone, me included.
And in fact, the BEST time to learning-by-enquiring IS NOW--when you are still low in the career ladder. Once you gather experience, typical human psychology tends to put limitations on the human psyche of many people on 'opening-up' to know/learn......sort of 'what-will-they-think-of-me' syndrome/mentality.
Now coming to your query about Indian & Foreign CTCs, pl note that the concept/practice of "CTC" is prevalent in very few countries including India. Most countries have a different Salary concept--'What's my In-hand?'. In addition to the parameters mentioned by the other members--like Exchange rates, cultural differences, etc--the general human psychology there is more focused on the 'present', rather than future [one reason why families go totally broke in the West during recession periods].
To give an example, in USA, let's say an employee is hired @ US$40K p.a., but apart from the Salary, the legal practice is to ADD 401k Plan amount to the salary of the employee & the Employer adds equal amount--something like PF in India [to plan for retirement & family emergencies] & most employers also have Medical Insurance payouts also. But when you ask the employee or the Employer about a person's salary, the figure given is 40K p.a.--the rest being 'taken-for-granted'.
In a simple way, this would be the gist of the answer to your query.
Hope this helped.
Rgds,
TS