If you invested $39,000 for 20 years at 7% interest rate how much would you get?
If it is compounded annually you will get $150917.69
39000×(1+0.07)20=150917.6940369609842462
Sorry anon, I did not realize that you have done the same thing :/
If you are talking about simple interest compounded annually and never take any money out you would wind up with:
39000 x 1.07^20 = 150,917.69