Exponential growth and compound interest

Your method is OK, but I get $14644.18 instead of your $14598.54.

Also: do NOT use the exact same title "exponential growth and compound interest" for two different threads. When you do that it makes it harder for other readers/helpers to navigate your PF threads.

 

Well, the correct answer is $14644.18, while your answer is $14598.54. Admittedly, the difference ($45.64) is not very large compared to the base values, but nevertheless one answer is not correct, no matter how you look at it.

As to rounding: I cannot answer that question because you do not specify what accuracy you round to. Generally, though, it is best to keep full calculator accuracy during your computations, and round off the answer only at the end.