Math Problem Statement

Will you earn more interest in one year by depositing ​$2000 in a simple interest account that pays 6% or in an account that pays 5.9​% interest compounded​ daily? How much more interest will you​ earn?

Solution

To determine which account will earn more interest, let's calculate the interest for both options.

Simple Interest Account:

The formula for simple interest is: I=P×r×tI = P \times r \times t where:

  • II is the interest,
  • PP is the principal ($2000),
  • rr is the annual interest rate (6% = 0.06),
  • tt is the time in years (1 year).

Substituting the values: I=2000×0.06×1=120I = 2000 \times 0.06 \times 1 = 120 So, the interest earned in the simple interest account is $120.

Compound Interest Account (Daily Compounding):

The formula for compound interest is: A=P(1+rn)ntA = P \left(1 + \frac{r}{n}\right)^{nt} where:

  • AA is the amount after interest,
  • PP is the principal ($2000),
  • rr is the annual interest rate (5.9% = 0.059),
  • nn is the number of times the interest is compounded per year (daily compounding means n=365n = 365),
  • tt is the time in years (1 year).

First, calculate the total amount after 1 year: A=2000(1+0.059365)365×1A = 2000 \left(1 + \frac{0.059}{365}\right)^{365 \times 1} Now calculate the interest earned: Icompound=API_{\text{compound}} = A - P

Let me compute this. Given values P = 2000 # Principal r = 0.059 # Annual interest rate n = 365 # Number of compounding periods per year (daily compounding) t = 1 # Time in years

Compound interest formula

A = P * (1 + r / n) ** (n * t) I_compound = A - P # Interest earned in the compound interest account

I_compoundThe interest earned in the compound interest account with daily compounding is $121.54.

Comparing the two:

  • Interest from the simple interest account: $120
  • Interest from the compound interest account: $121.54

So, the compound interest account earns $1.54 more than the simple interest account.

Would you like more details or have any questions? Here are some related questions you might find interesting:

  1. How does the frequency of compounding affect the total interest earned?
  2. What would happen if the time period were longer, say 5 years?
  3. How would the interest change if the rates were both increased to 7%?
  4. How does simple interest compare to compound interest for small amounts of time?
  5. If I deposited $3000 instead of $2000, how would that affect the interest earned in both cases?

Tip: When comparing simple vs. compound interest, the more frequently interest is compounded, the greater the total amount earned, especially over longer periods.

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Math Problem Analysis

Mathematical Concepts

Simple Interest
Compound Interest
Exponential Growth
Financial Math

Formulas

Simple Interest: I = P × r × t
Compound Interest: A = P(1 + r/n)^(nt)

Theorems

Compound Interest Theorem

Suitable Grade Level

Grades 9-12