Jorge invested $6,400.00 into a certificate of deposit that earned an annual interest rate of 6.7% compounded semiannualy.

a) Find the formula $\displaystyle {A}{\left({t}\right)}$, which represents the value of Jorge's account after $\displaystyle {t}$ years. Record the formula below.

$\displaystyle {A}{\left({t}\right)}=$Preview Question 6 Part 1 of 3  

Your answer that you type above should look something like
$\displaystyle {A}{\left({t}\right)}={2500}\cdot{\left({1}+\frac{{.05}}{{12}}\right)}^{{{12}\cdot{t}}}$.

b) What is the value of Jorge's account after 9 years? Round your final answer to two decimal places.

$

c) What is the rate of change in the value of Jorge's account after 12 years? Round your final answer to two decimal places.

$ per year