Doug invested $2,500 earning 4.5% interest. How long will it take to double Doug's investment?

16 years

Step-by-step explanation: If you take $2,500 with 4.5% interest, you will get $5,055 so it is about 16 years.

step by step solution :

step   1   :

1.1     4 = 22

(4)3 = (22)3 = 26

equation at the end of step   1   :

  ((23) • 26)2

step   2   :

equation at the end of step   2   :

  (23 • 26)2

step   3   :

final result :

  218

ya

a long term investor

step-by-step explanation:

because he is a long term investor