Question 1177632
P=Po(1+r/n)^nt , where n is number of times compounded per year (1 here) and t the number of years,
Misread problem and had 4000 on my mind.
3000=2000(1+.04)^t
1.5=1.04^t
ln both sides
ln1.5=t ln 1.04
divide ln1.5/ln/1.04;t=10.34years
rule of 70 increase by 50% time is about 41/interest rate, and that would predict 10.25 years here.