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UkoKoshka [18]
3 years ago
10

Cooper invested $3,100 in an account paying an interest rate of 2%

Mathematics
1 answer:
Liula [17]3 years ago
3 0

Answer:

Robert will have $481 more in his account than Cooper.

Step-by-step explanation:

Compound interest:

The compound interest formula is given by:

A(t) = P(1 + \frac{r}{n})^{nt}

Where A(t) is the amount of money after t years, P is the principal(the initial sum of money), r is the interest rate(as a decimal value), n is the number of times that interest is compounded per year and t is the time in years for which the money is invested or borrowed.

Continuous compounding:

Similar to compound interest:

A(t) = P(1 + r)^t

Cooper:

Cooper invested $3,100 in an account paying an interest rate of 2% compounded quarterly. This means that P = 3100, r = 0.02, n = 4

After 12 years is A(12). So

A(t) = P(1 + \frac{r}{n})^{nt}

A(12) = 3100(1 + \frac{0.02}{4})^{4*12}

A(12) = 3938.5

Cooper will have $3938.5 in his account.

Robert:

Robert invested $3,100 in an account paying an interest rate of 3 % compounded continuously. So P = 3100, r = 0.03.

After 12 years.

A(t) = P(1 + r)^t

A(12) = 3100(1 + 0.03)^{12}

A(12) = 4419.9

Robert will have $4419.9 in his account.

How much more money would Robert have in his account than Cooper, to the nearest dollar?

4419.9 - 3938.5 = 481.4

To the nearest dollar, Robert will have $481 more in his account than Cooper.

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