I=Prt Simple interest is the principle times the rate times the time.
The balance will be the principle plus that interest so:
B=P(1+rt), since P=5000 and the rate is 0.055
B=5000(1+0.055t) so at the beginning of the sixth year you will have earned five years of interest.
B=5000(1+0.055(5))
B=$6375