Solve the Problem $7.2 \mathrm { yr }$ B) $8.8 \mathrm { yr }$

Multiple Choice

Solve the problem.
-Find the number of years for $8400 to grow to $12,900 at 6% compounded semiannually. Round to the nearest tenth of a year.

A) $7.2 \mathrm { yr }$
B) $8.8 \mathrm { yr }$
C) $6.4 \mathrm { yr }$
D) $7.3 \mathrm { yr }$