The average salary for all staff of a school is Rs. 8000. The average salary of 12 technical staff is Rs. 72,000 and non-technical staff average salary is Rs. 7000, then find the number of non-technical staff.
1
768
2
204
3
504
4
780
The average salary for all staff of a school is Rs. 8000. The average salary of 12 technical staff is Rs. 72,000 and non-technical staff average salary is Rs. 7000, then find the number of non-technical staff.