So, we'll find out how much interest this person will have in 6 years and then add it to the original deposit. To do this we will multiply all the factors:
500 x 0.04 x 6 = 120. This means they'll have made $120 in interest in 6 years if they don't touch the money. We will add the 120 to the 500. 500+120= 620
They will have a total of $620 in their account after 6 years.