Growth and Decay!!!

[darealmzd]

The populations P (in thousands) of a certain city from 2000 through 2007 can be modeled by P = 344.3e^kt,
where t represents the year, with t = 0 corresponding to 2000. In 2005, the population of the city was about 399,000.

Find the value of k. (Round your answer to five decimal places.)

Could some one please help me. At first I tried ln(399000/344.3)/5 = k, but it was marked wrong.

 

[mmm4444bot]

I tried ln(399000/344.3)/5 = k, but it was marked wrong.

Why did you not use a scientific calculator to evaluate the expression, to get a decimal approximation for k?

The exercise asks for the value of k.