The average salary per head of the entire staff of an office including the officers and clerks is Rs.90. The average salary of officers is Rs.500 and that of the clerks is Rs.84. If the number of officers is 2, find the number of officers in the office?	Choose the correct answer
A) 620 B) 720 C) 820 D) 920 E) 1020
500 84   \ /   90   / \   6 410   3:205   3-&gt;12   205-&gt;?   820   ANSWER:820
<result>C</result>
The average salary per head of the entire staff of an office including the officers and clerks is Rs.90. The average salary of officers is Rs.500 and that of the clerks is Rs.84. If the number of officers is 2, find the number of officers in the office?