user: Question: What is the average start for the season with $7,220 in winnings?
Columns: ['Year', 'Starts', 'Wins', 'Top 5', 'Top 10', 'Poles', 'Avg. Start', 'Avg. Finish', 'Winnings', 'Position', 'Team(s)']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2000.0, 1.0, 0.0, 0.0, 0.0, 0.0, '7.0', '29.0', '$7,220', '103rd', '#5 Ultra Motorsports']
SQL:

assistant: SELECT "Avg. Start" FROM "Table" WHERE "Winnings" = '$7,220';