Mathematics, 31.12.2020 14:00 mfg1235

Alberto invests his $90 for 2 years at r % per year simple interest. At the end of 2 years the amount of money he has is $99.
Calculate the value of r.

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Alberto invests his $90 for 2 years at r % per year simple interest. At the end of 2 years the amou...