Its not easy as they show in filims to get alimony maintenance. If husband is earning that much better to go and stay with husband.
Proving salary slips will be first task.
Proving where and how you got that salary slip is second task.
If he is working in private and still gettting such huge salary, then court will not order what you want as private jobs are not permanent ones.
Plus mother has to contribute equally towards such kids expenses. If you are asking 30000, you will have to show that you are paying 15000 to kid. But will kid require 15000 ? per month?
Its not a eash case. If you have taken divorce already then simply go for 1 time settlement, ask 1 crore one shot.
Or simply give off the kid, coz till the time kid turns 18 you can play maintenance maintenance. After kit turns 18, your play will become headache. Then comes marriage expenses.
etc et.c. Case of maintenance will run till kid turns 18 with no guarantee of getting money through court.