user: Question: What is the function percentage when the estimated function percentage is 20?
Columns: ['Grade', 'Description', 'Measurement', 'Function %', 'Estimated function %']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['I', 'Normal', '8/8', '100', 100.0]
SQL:

assistant: SELECT "Function %" FROM "Table" WHERE "Estimated function %" = 20.0;