Mathematics, 17.12.2020 21:10 Janupedia

vien invested $880, part at 9% per annum and the rest at 12% per annum. After one year the total intrest earned was $79.50. How much did he invest at each year?

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vien invested $880, part at 9% per annum and the rest at 12% per annum. After one year the total int...