Question

$8,000 is invested in a simple annual interest rate of 6%. find the balance of the investment after 5 years

Answer 1

is $2,400.00 the right answer? I did 8000 * .06 *5

Answer 2

You got the amount of interest correct, but the question wants to know the balance not just the interest. Try this formula
P(1+(interest)(number of years))
or just add the interest you caclucated to the original principal

Answer 3

$104,00 is it right