SOLUTION: One sum is invested at 5% and three times as much at 8%. The total annual interest is \$580. How large is each sum? (this is not from a text) I have a problem with both answers. P

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 Question 38954: One sum is invested at 5% and three times as much at 8%. The total annual interest is \$580. How large is each sum? (this is not from a text) I have a problem with both answers. Please help, Thank You.Answer by fractalier(2101)   (Show Source): You can put this solution on YOUR website!Let x be the amount invested at 5%. Thus 3x was invested at 8%. The total interest is \$580. Here's the setup: (.05)x + (.08)(3x) = 580 multiply by 100 to clear decimals 5x + 24x = 58000 29x = 58000 x = \$2000 at 5% 3x = \$6000 at 8%