So the annual rate is 7% (0.07). The account starts with $50. The money sits in there untouched for 8 years.
1. 50 * 0.07 = 3.5
50 + 3.5=53.5
2. 53.5 * 0.07 = 3.745
53.5 + 3.745 = 57.245
3. 57.245 * 0.07
Now you do the rest. I did up to year two for you, go ahead and complete the rest by yourself. If you have questions please ask I would love to help. :)