Simple Interest
The interest earned by an investment, also called principal, depends on three variables:
p=starting amount of money or principal
r=rate of interest
t=duration of the investment
Now let's get on the question. Farid has $66,256 in a savings account. It means that p=66,256. The account earns 5% interest per year. This data is r=5% and must be converted to a decimal by dividing by 100, r=0.05.
We also know the investment has a duration of t= 5 years.
We have all the needed data to calculate the interest by using the formula.
I = p*r*t
Substituting.
I=66,256*0.05*5
Calculating:
I=16,564
The interest earned in 5 years is $16,564
The balance in the account is:
M = $66,256 + $16,564 = $82,820
Final balance: $82,820