$566,400.

In the first round of Jeopardy there is $18,000 on the board (1000 + 800 + 600 + 400 + 200 = 3000 times 6 categories = 18,000). If one contestant got all of the 'questions' correct, the Daily Double were in a $200 dollar slot, and the Daily Double was the last slot selected for the first round, that contestant would have $17,800 at the time of selecting the Daily Double. Betting all of that and giving the correct question to the answer would give the contestant $35,600 for the first round.

In the second round of Jeopardy (Double Jeopardy) there is $36,000 on the board (2000 + 1600 + 1200 + 800 + 400 = 6000 times 6 categories = 36,000). If the same contestant got all of the 'questions' correct, the Daily Doubles (2 Daily Doubles in Double Jeopardy) were in $400 dollar slots, and the Daily Doubles were the last two slots selected for the round, that contestant would have $70,800 at the time of selecting the first Daily Double ($35,600 from the first round and $35,200 from the second round). Selecting the first Daily Double, betting it all and giving the correct question would give the contestant $141,600. Selecting the second Daily Double, betting it all, and giving the correct question would give the contestant $283,200.

Then the contestant bets it all in Final Jeopardy and gives the correct question to win $566,400. There used to be a cap on winnings in one day and on the number of times a champion can return, however, these rules have been changed, so there is no winnings limit, and a champion may reign indefinitely. Read the COMPLETE MODEL and calculations (even with computer simulations) at http://www.cstutoringcenter.com/jeopardy Of course it would be more money if they could bet a dollar and get the odds of it actually happening. Not just the location of the doubles but also the other contestants failing to answer any questions