Justin invested $21538 for 3 years and received $12276.66 in interest.  At what rate did he invest if the interest was calculated using the simple interest formula?  

Justin invested $21538 for 3 years and received $12276.66 in interest.  At what rate did he invest if the interest was calculated using the simple interest formula?  Leave your solution in percentage form.  %
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1 Answer

I=PTR/100, 12276.66=21538×3R/100, R=1227666/64614=19%.

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