Residuary Choice Pay is generally for services provided which generate revenue ,even long after the service was provided-say as in film industry, music industry etc.
Basic pay/ breakdown of CTC should be got clarified before joining.There is no fixed % for the components of CTC but norms are generally -Basic -50%, HRA based on type of city--A, B, C etc.
17th October 2016 From India, Delhi
They will be able to tell you the take home pay only after that.
For example, they may have a option of Superannuation contribution or cash in lieu thereof.
If you opt for benefit, they will contribute that amount to the superannuation fund and you will get that accumulation on retirement / resignation as per Company policy. It will reduce your take home pay. If you opt for cash, it will be part of your take home pay and you wont get the superannuation accumulation at the time of retirement / resignation.
Further, these choices clubbed with your tax saving investment will affect your tax working. Thus, they will be able to tell you the final take home pay after your choices.
However, based upon what you have written, it is a good offer and there seems to be no problem.
Every Company has its own system of salary break-up. You should not worry even if the basic is low as the overall package is higher.
18th October 2016 From India, New Delhi