If $\$ 600$ Is Invested At $4 \%$ Interest, Compounded Annually, Then After

Multiple Choice

If $\$ 600$ is invested at $4 \%$ interest, compounded annually, then after $n$ years the investment is worth $a _ { n } = 600 ( 1.04 ) ^ { n }$ dollars. Find the size of investment after 7 years.

A) $\$ 430.21$
B) $\$ 1,860.81$
C) $\$ 1,230.81$
D) $\$ 789.56$
E) $\$ 1,321.06$