After 5 years of investing $50 per month @ 8% APR, you would have $3,698.34.
If you leave this amount of money in the account without adding any more money at the same interest rate, you would have $27,146.47 at the end.
The first calculation made in EXCEL using the FV function.
The second formula calculation is
Future Money = Present Money(1 + Period Interest Rate)(# of periods)