Math Problem Statement
If you paid $ 59 to a loan company for the use of $ 1 comma 064 for 127 days, what annual rate of interest did they charge? (Assume a 360-day year.)
Solution
To find the annual rate of interest charged, we can use the simple interest formula:
Where:
- is the interest paid,
- is the principal (the amount borrowed),
- is the annual interest rate (what we need to find),
- is the time in years.
Step 1: Organize the information given:
- (the amount paid to the loan company),
- (the amount borrowed),
- (since 127 days is a fraction of the 360-day year).
Step 2: Rearrange the simple interest formula to solve for :
Step 3: Plug in the known values:
Let me calculate that for you.The annual interest rate charged by the loan company is approximately 15.72%.
Would you like further clarification or details on this process?
Here are five related questions for further practice:
- How would the interest change if the loan term was 180 days instead of 127 days?
- What would the interest rate be if only $45 was paid in interest for the same loan amount and period?
- How much interest would be paid if the loan was $2,000 over 200 days with the same interest rate?
- What happens to the interest rate if the principal amount borrowed is doubled?
- How does using a 365-day year instead of a 360-day year affect the interest calculation?
Tip: When calculating simple interest, always ensure the time period is in years, especially when working with daily or monthly periods.
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Math Problem Analysis
Mathematical Concepts
Simple Interest
Proportion
Interest Rate Calculation
Formulas
I = P * r * t
r = I / (P * t)
Theorems
-
Suitable Grade Level
Grades 10-12
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