By Deb Russell

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What Annual Rate of Interest Is Needed for $2100.00 to earn $122.50 in 14 Mths?

When the amount of interest, the principal and the time period are known, you can use the derived formula from the simple interest formula to determine the rate. I=Prt becomes r=I/Pt. Remember to use 14/12 for time and move the 12 to the numerator in the formula above. Get your calculator and check to see if you're right.

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- Calculating Interest: Principal, Rate and Time are Known
- Calculating Interest Earned when Principal, Rate and Time are Known
- Calculating Interest When the Time is Given in Days
- What's the Interest on $890.00 at 12.5% for 261 Days?
- Find the Principal When you Know the Interest, Rate, and Time
- What Sum of Money Can you Invest for 300 Days at 5.5% to Earn $93.80?
- What Annual Rate of Interest Is Needed for $2100.00 to earn $122.50 in 14 Mths?

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