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:

I=P×r×tI = P \times r \times t

Where:

  • II is the interest paid,
  • PP is the principal (the amount borrowed),
  • rr is the annual interest rate (what we need to find),
  • tt is the time in years.

Step 1: Organize the information given:

  • I=59I = 59 (the amount paid to the loan company),
  • P=1064P = 1064 (the amount borrowed),
  • t=127360t = \frac{127}{360} (since 127 days is a fraction of the 360-day year).

Step 2: Rearrange the simple interest formula to solve for rr:

r=IP×tr = \frac{I}{P \times t}

Step 3: Plug in the known values:

r=591064×127360r = \frac{59}{1064 \times \frac{127}{360}}

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:

  1. How would the interest change if the loan term was 180 days instead of 127 days?
  2. What would the interest rate be if only $45 was paid in interest for the same loan amount and period?
  3. How much interest would be paid if the loan was $2,000 over 200 days with the same interest rate?
  4. What happens to the interest rate if the principal amount borrowed is doubled?
  5. 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 tt 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

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Suitable Grade Level

Grades 10-12