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Mathematics, 20.09.2021 14:00 Karamatullah

Roberto invested some money at 2.75%, and then invested $4000 more than twice this amount at 3%. His total annual income from the two investments was $1257.50.
How much was invested at 3%?

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Roberto invested some money at 2.75%, and then invested $4000 more than twice this amount at 3%. H...
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