Solve
-Find Out How Long It Takes A $\$ 3000$ Investment to Earn

Multiple Choice

Solve.
-Find out how long it takes a $\$ 3000$ investment to earn $\$ 400$ interest if it is invested at $9 \%$ compounded semiannually. Round to the nearest tenth of a year. Use the formula $A = \mathrm { P } \left( 1 + \frac { \mathrm { r } } { \mathrm { n } } \right) ^ { n t }$ .

A) $1.6$ years
B) $1.8$ years
C) $1.2$ years
D) $1.4$ years