Mathematics, 11.05.2021 08:30 betoo9090

Zena invested $8000, part at 9% per year and the remainder at 4% per year. After one year, the total interest from these investments was $420. How much did she invest at each rate?

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Zena invested $8000, part at 9% per year and the remainder at 4% per year. After one year, the total...