Question 154514
I think I might have found a solution for you.


I'm not sure if you're familiar with PERT,  {{{Pe^rt}}}  but it's a very useful model for computing population growth over time.  In this case, we can use it to model the growth of motor vehicles over time.


So for this little problem, I came up with


V(t) = {{{168(million)e^(0.04t)}}}


We set this up by knowing that in {{{Pe^rt}}}, P is the principle (or the population where time is zero), r is rate, and t is time.


If you choose values for time and plug this into your calculator, you shouold come up with pretty accurate answers.