Table: web_browser_usage_4
Columns: internet_explorer
firefox_other_mozilla
chrome
safari
opera

Question: What percentage of browsers were using Firefox or other Mozilla browsers during the period in which 1.93% were using Chrome?
SQL: SELECT "firefox_other_mozilla" FROM web_browser_usage_4 WHERE "chrome" = '1.93%'

Question: What percentage of browsers were using Internet Explorer during the period in which 24.91% were using Chrome?
SQL: SELECT "internet_explorer" FROM web_browser_usage_4 WHERE "chrome" = '24.91%'

Question: What percentage of browsers were using Chrome during the period in which 72.03% were using Internet Explorer?
SQL: SELECT "chrome" FROM web_browser_usage_4 WHERE "internet_explorer" = '72.03%'

Question: What percentage of browsers were using Safari during the period in which 2.05% were using Chrome?
SQL: SELECT "safari" FROM web_browser_usage_4 WHERE "chrome" = '2.05%'

Question: What percentage of browsers were using Chrome during the period in which 0.30% were using Opera and 6.77% were using Safari?
SQL: SELECT "chrome" FROM web_browser_usage_4 WHERE "opera" = '0.30%' AND "safari" = '6.77%'