Question

Herky and Elaina want to compare their investment accounts to see how much they will have in the accounts after eight years. They substitute their values shown below into the compound interest formula.

Compound Interest Accounts
Name
Principal
Interest Rate
Number of Years
Compounded
Herky
$500
5%
8
Once a year
Elaina
$400
6%
8
Once a year
A = P (1 + r) Superscript t

Which pair of equations would correctly calculate their compound interests?
Herky: A = 500 (1 + 0.08) Superscript 5, Elaina: A = 400 (1 + 0.08) Superscript 6
Herky: A = (500 times 1) + (0.05) Superscript 8, Elaina: A = (400 times 1) + (0.06) Superscript 8
Herky: A = 500 (1 + 0.05) Superscript 8, Elaina: A = 400 (1 + 0.06) Superscript 8
Herky: A = (500 times 1) + (0.05) Superscript 8, Elaina: A = (400 times 1) + (0.05) Superscript 8

Answer 1

Herky : A=500(1+0.05)^8 Elaina: 400(1 + 0.06)^8

Explanation:

Answer 2

Answer: C or third answer

Herky : A=500(1+0.05)^8 Elaina: 400(1 + 0.06)^8

Explanation:

P = Principal

r = (interest) Rate

t = time or number of years.