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Shota invests 
$1000 in a certificate of deposit that earns interest. The investment's value is multiplied by 1.02 each year.
Which expression gives the investment's value after 5 years?
Choose 1 answer:
(A) 
1000+1.02^(5)
(B) 
1000+(1+1.02)^(5)
(C) 
1000*1.02^(5)
(D) 
1000*(1+1.02)^(5)

Shota invests $1000 \$ 1000 in a certificate of deposit that earns interest. The investment's value is multiplied by 11.0202 each year.\newlineWhich expression gives the investment's value after 55 years?\newlineChoose 11 answer:\newline(A) 1000+1.025 1000+1.02^{5} \newline(B) 1000+(1+1.02)5 1000+(1+1.02)^{5} \newline(C) 10001.025 1000 \cdot 1.02^{5} \newline(D) 1000(1+1.02)5 1000 \cdot(1+1.02)^{5}

Full solution

Q. Shota invests $1000 \$ 1000 in a certificate of deposit that earns interest. The investment's value is multiplied by 11.0202 each year.\newlineWhich expression gives the investment's value after 55 years?\newlineChoose 11 answer:\newline(A) 1000+1.025 1000+1.02^{5} \newline(B) 1000+(1+1.02)5 1000+(1+1.02)^{5} \newline(C) 10001.025 1000 \cdot 1.02^{5} \newline(D) 1000(1+1.02)5 1000 \cdot(1+1.02)^{5}
  1. Understand the problem: Understand the problem.\newlineWe need to find the value of an investment after 55 years, where the investment increases by a factor of 1.021.02 each year.
  2. Identify the correct expression: Identify the correct expression.\newlineThe investment is multiplied by 1.021.02 each year, so we need to use an expression that represents this annual multiplication over 55 years.
  3. Evaluate the options: Evaluate the options.\newline(A) 1000+1.0251000+1.02^{5} suggests an addition, which is incorrect for yearly multiplication.\newline(B) 1000+(1+1.02)51000+(1+1.02)^{5} suggests adding 11 to 1.021.02 before raising to the power of 55, which is not the correct interpretation of the problem.\newline(C) 1000×1.0251000\times1.02^{5} correctly represents the initial investment multiplied by 1.021.02 raised to the power of 55, which is the number of years.\newline(D) 1000×(1+1.02)51000\times(1+1.02)^{5} incorrectly suggests adding 11 to 1.021.02 before multiplying, which is not how the interest is applied.
  4. Choose the correct expression: Choose the correct expression.\newlineThe correct expression is (C) 1000×1.0251000 \times 1.02^{5} because it accurately represents the initial investment being multiplied by 1.021.02 each year for 55 years.

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