Answer:
It takes 41 years for $20 to grow to $99.86 and if you rounded that up, it would be $100 or if you want it to surpass $100 it would take 42 years turning $20 to $103.85
(Edit: I'm wrong go with the guy on top)
100 years
Explanation:
Simple interest means 4% on the 20$ only and forever.
100-20=80 dollars.
4% of 20 is 0.80
80/0.80 = 100
It will take 100 years
5.3m questions
6.8m answers