Abbi invested $1,000 in a certificate of deposit with a simple interest rate of 4%. Find the interest earned in 8 years. Then find the total of principal plus interest.

I = PRT

I = 1,000 * 0.04 * 8
I = ?

To find the interest earned in 8 years, you can use the formula:

Interest = Principal × Rate × Time

In this case, the principal is $1,000 and the interest rate is 4%. However, since it is a simple interest rate, it remains constant throughout the entire period. So the formula becomes:

Interest = $1,000 × 0.04 × 8 = $320

Therefore, Abbi earned $320 in interest over 8 years.

To find the total of the principal plus interest, you need to add the interest earned to the original principal amount:

Total = Principal + Interest

Total = $1,000 + $320 = $1,320

So, the total amount after 8 years would be $1,320.