Which nation, with a population ranging from 60,000,000 to 99,000,000, has the greatest gross domestic product?
GDP refers to gross domestic product; Nation and country are synonyms
SELECT T1.Name, T2.GDP FROM country AS T1 INNER JOIN economy AS T2 ON T1.Code = T2.Country WHERE T1.Population BETWEEN 60000000 AND 90000000 ORDER BY T2.GDP DESC LIMIT 1