Dan has 500 dollars in the bank. his money earns 3 percent interest. if he doesn't deposit or withdraw any money, how much interest will he earn in 8 years?

It's about simple interest and which is very easy to solve 

Simple Interest
Where 
P=500
R=3
T=8

S.I=P.R.T/100
S.I=500*3*8/100
S.I=12000/100
S.I=120 $
So answer is 120$ interest will he earn in 8 year 

Note: If any problem then feel free to contact me