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题目材料：
If the average (arithmetic mean) salary of the full professors whose salaries were in the interval $50,000-$120,000 was $$x$$, and if the average salary of the full professors whose salaries were $120,000 and above was $$y$$, what was the average salary of all the full professors, in terms of $$x$$ and $$y$$?
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A.$$1.00x + 0.1y$$
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B.$$0.50x +0.14y$$
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C.$$0.50x +0.50y$$
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D.$$0.86x + 0.14y$$
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E.$$0.86x + 0.50y$$
D显示答案
