A fool would put it all in the stock market but since we do have fools within this world.

The average stock market earn 10% thats 100million

It would earn the same interest as $100. Just depends where you put it and how far out on the yield curve you go. Short term money market=not much. Long-term bond=more

Depends on the interest rate and what type of interest it is.

0% Obama spent it already.

Depends where you put it.