In 2000, there were about 200 million vehicles and about 279 million people in a certain country. the number of vehicles has been growing at 4% a year, while the population has been growing at 1% a year.
(a) Write a formula for the number of vehicles (in millions) as a function of t, the number of years since 2000.
V(t) =

Question

In 2000, there were about 200 million vehicles and about 279 million people in a certain country. the number of vehicles has been growing at 4% a year, while the population has been growing at 1% a year.
(a) Write a formula for the number of vehicles (in millions) as a function of t, the number of years since 2000.
V(t) =

anonymous · Answer

I am not quite sure about your question: do you mean that you want a formula just to show the realtionship between the number of vehicle(in M) and the time t(in years and since 2000)?
if so ,the answer should be $$N _{t}==(200)*1.04^t$$, where N is the number of the $$N _{t}$$ is the number of vechiles in year t.
Hopefully, this is what you want to know.
and by the way~
you may want to ask the the average number of vechiles per people in year t
 if it is in this case, the answer should be the following:
$$A _{t}=( N _{t})/[P _{t}$$,
where,  $$N _{t}=(200)*1.04^t$$ 
and $$P _{t}=279*(1+1/100)^{t}$$