David used part of $100,000 to purchase a house. Of the remaining portion, he invested \frac{1}{3} of it at 4 percent simple annual interest and \frac{2}{3} of it at 6 percent simple annual interest. If after a year the income from the two investments totaled $320, what was the purchase price of the house?
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A$96,000
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B$94,000
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C$88,000
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D$75,000
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E$40,000