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(.14)w + .105(1-w) = .124
w = .543 = weight in stock x
1-w = .457 = weight in stock y
.543($10,000) = $5,430 in Stock X
.457($10,000) = $4,570 in Stock Y
(Or more precisely, carrying out the decimal places, $5,428.57 in Stock X and $4,571.42 in Stock Y)...