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Calculate Simple Interest, Principal, Rate or Time when 3 Values are Known

By Deb Russell, About.com

4 of 7

What's the Interest on $890.00 at 12.5% for 261 Days?

890
Once again, you can apply the forumula I = Prt. You have all the information you need to determine the interest on this question. Remember, 261/365 days is the calculation for the t - time.

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