What percentage of countries in South Asia have the Life expectancy at birth, female (years) greater than 50?
South Asia is the name of the region; IndicatorName = 'Life expectancy at birth, female (years)'; greater than 50 refers to Value>50; DIVIDE(COUNT(CountryCode where IndicatorName = 'Life expectancy at birth, female (years)'; Value>50; Region = 'South Asia'), COUNT(CountryCode where Region = 'South Asia')) as percentage;
SELECT CAST(SUM(CASE WHEN T2.value > 50 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.CountryCode) FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.CountryCode WHERE T1.Region = 'South Asia' AND T2.IndicatorName = 'Life expectancy at birth, female (years)'