x-y=0+0.07x+0.08y=720

Nelson has half of his investments in a stock paying a 7% dividend and the other half in a stock paying 8% interest. If his total annual return is $720, How much does he have invested?
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If his investment is P dollars then 7% of P/2 is 0.035P and 8% of P/2 is 0.04P. Therefore, 0.075P=$720 and P=720/0.075=720000/75=$9600.
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