In what percentage of counties has the ABC Read project been launched?
ABC Read project been launched refers to title = 'ABC Read'; percentage refers to DIVIDE(count(case when title = 'ABC Read' then school_county else null end),count(school_county))*100
SELECT CAST(SUM(CASE WHEN T2.title LIKE 'ABC Read' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.school_county) FROM projects AS T1 INNER JOIN essays AS T2 ON T1.projectid = T2.projectid