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纠错
题目材料：
At Site II, if the average (arithmetic mean) salaries in production, administration, and research are $$x$$, $$y$$, and $$z$$ dollars, respectively, what is the average salary, in dollars, of all employees at Site II?
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A.$$\frac{(x+y+z)}{3}$$
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B.$$0.3x+0.3y+0.4z$$
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C.$$\frac{(0.3x+0.3y+0.4z)}{3}$$
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D.$$\frac{(0.3x+0.3y+0.4z)}{1530}$$
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E.$$(0.3)(1530)x+(0.3)(1530)y+(0.4)(1530)z$$
B显示答案
