I knew that wasn't the answer that shabbir was looking for

My answer: $235700

Since the current year is 2009AD and the coin dates back to 250BC.
So the difference in yrs is 2009-(-250) = 2259
And the prize is only for old coins so current year would not yield any money
and $100/year and $10,000 for first year so... 2257*100+10000 = 235700