25% of the officers in a camp are senior officers and the remaining are junior officers. The monthly wage of each senior officer is $4,500 and the monthly wage of each junior officer is $3,500. What is the average monthly wage of all officers in the camp?
(A)
(B)
(C)
(D)
The solution is here
http://www.satmath4u.com/threads/110-sat-math-problem-average
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