Answer:
B. 3
Step-by-step explanation:
Compound interest means it builds up over time, and is based off the total from each year, not overall.
9% interest means it increases by x0.09 each year
Add 1 to this, to account for the start amount (100%)
so 6000x1.09^(y) ≈ 8000
y being the number of years taken
I used the ≈ than symbol instead of equals because it most likely will not be exactly 8000, and therefore should be as close as it can be to 8000.
I then substituted in the number of years given to get outcomes of:
A. 43547
B. 77770
C. 13031
D. 7128
E. 223905
B is therefore closest, meaning it is the answer.