Mathematics, 03.02.2020 19:52, nenaa29

Piotr galkowski invested some money at 3.5% simple interest, and $5000 more than three times this amount at 4%. he earned $1440 in annual interest. how much did he invest at each rate?

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Piotr galkowski invested some money at 3.5% simple interest, and $5000 more than three times this am...