Avg. amt. of annual interest earned across 3 investment acct's was 2709. If 1 accn't yielded 1345 in a 12 month period, and 2nd yielded 568, what did 3rd accn't yield?
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beckden
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First (A + B + C)/3 = 2709
so
(1345 + 568 + x)/3 = 2709
1345 +...
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