CREATE TABLE table_65831 ("Internet Explorer" TEXT, "Firefox  ,  Other Mozilla" TEXT, "Chrome" TEXT, "Safari" TEXT, "Opera" TEXT)

What percentage of browsers were using Chrome during the period in which 0.30% were using Opera and 6.77% were using Safari?
SELECT "Chrome" FROM table_65831 WHERE "Opera" = '0.30%' AND "Safari" = '6.77%'
SELECT "Chrome" FROM "table_65831" WHERE "Opera" = '0.30%' AND "Safari" = '6.77%'