user: Question: If the location is Brooklyn, Michigan and the pole position is Bobby Unser, what is the RND total number?
Columns: ['Rnd', 'Date', 'Race Name', 'Length', 'Track', 'Location', 'Pole Position', 'Winning Driver']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'April 7', 'Texas 200', 'mi (km)', 'Texas World Speedway', 'College Station , Texas', 'Bobby Unser', 'Al Unser']
SQL:

assistant: SELECT SUM("Rnd") FROM "Table" WHERE "Location" = 'Brooklyn, Michigan' AND "Pole Position" = 'Bobby Unser';