It is not only the salary matters...
salary most of the time 7,500 would do.

But make sure that your proffesion in the ID is in the list of family visa group.

You should maintain your bank balances, and also your salary should transwer to the bank account.

You need to get a housing conformation letter or a housing contract.

make sure these things before doing the application. bank things need docs for minimum 3 months.

Check with others too from ur country. this is what i know.

all the best