What is 12K in 40 years?

I have a 401k with about $12,000 from a previous employer. When I rolled it over I diversified it in to different portfolios. Some are low risk but most high risk. I have noticed that I don't earn much interest on them each year. How much will this $12,000 be in 40 years when I retire. I am not adding anything to it since I have a seperate 401k with the compnay I work for now. If it is not much, I am thinking about just taking the hit and cashing it out and paying off some debt. If I do that I will have more free money to pay off more debt and then I can invest more in my current 401K. I know nobody can perdict the stock market, but is that 12k going to be closer to 20k or 100k? Just a rough idea would be great.