user: Question: What was spent per voter when the spent per vote was 20.07?
Columns: ['Candidate (Party)', 'Amount raised ( PHP )', 'Amount spent ( PHP )', 'Votes', 'Spent per vote ( PHP )', 'Spent per voter ( PHP )']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Benigno Aquino III (LP)', '440,050,000 (approx.)', '403,119,981.81', 15208678.0, '26.51', '7.86']
SQL:

assistant: SELECT "Spent per voter ( PHP )" FROM "Table" WHERE "Spent per vote ( PHP )" = '20.07';