This answer is purely my opinion which i shall substantiate:-
Q-1 Salary 10L and Comm 11L
he needs to take registration as the Threshold limit of Rs20 Lakhs exceeded. While computing aggregate Turnover even exempt turnover is to be included. Exempt turnover includes nil rates, exempted and non-taxable supppies. Salary is covered under Schedule III ie services rendered by employee to employee in the course of employment. hence it is a non-taxable supply. Hence it has been included in computing aggregate turnover
Q2 - Salary 10L and Commission 9 L
Since the aggregate turnover doesnot exceed 20 L no need to get registered.