user: Question: What percentage of browsers were using Chrome during the period in which 0.30% were using Opera and 6.77% were using Safari?
Columns: ['Internet Explorer', 'Firefox , Other Mozilla', 'Chrome', 'Safari', 'Opera']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['43.38%', '19.42%', '24.91%', '9.27%', '0.75%']
SQL:

assistant: SELECT "Chrome" FROM "Table" WHERE "Opera" = '0.30%' AND "Safari" = '6.77%';