user: Question: What is average prize for first place with a $500000 purse in the Franklin Quest Championship?
Columns: ['Date', 'Tournament', 'Location', 'Purse( $ )', 'Winner', 'Score', '1st Prize( $ )']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'real']
Sample row: ['Jan 9', 'Mercedes Championships', 'California', 500000.0, 'Jack Nicklaus (7)', '279 (-9)', 100000.0]
SQL:

assistant: SELECT AVG("1st Prize( $ )") FROM "Table" WHERE "Purse( $ )" = 500000.0 AND "Tournament" = 'Franklin Quest Championship';