Question 172926
The way I read that problem is -- a guy win 16M.
He spends 50% of that in the first year (16M*.5), so he has 8M left
He spends 50% of the remainder the next year 8M*.5, so he has 4M left
He keeps doing that up to 10 years.
How much is left

{{{16M * (0.5)^10}}}= 15625