An investment of $4000 earns interest, which causes it to increase by 6% per year.

a) Write an equation for the amount, A, in dollars, that the investment is worth as a function of time, n, in years.

b) Determine the amount that the investment is worth after

i) 2 years ii) 10 years iii) 20 years

c) what is the value and meaning of the function at n=0?