A person invested $6600 for 1 year, part at 7%, part at 11%, and the remainder at 12%. The total annual income from these investments was $719. The amount of money invested at 12% was $800 more than the amounts invested at 7% and 11% combined. Find the amount invested at each rate. ..... The person invested $ at 7%, $ at 11%, and $ at 12%.

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