Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_21926985_2 ( state_rank_by_revenue VARCHAR, revenue__$billions__2012_estimate VARCHAR )

### Question ###
What is the state rank of the company with 6.8 billion in revenue?

### Accurate SQL ###

SELECT state_rank_by_revenue FROM table_21926985_2 WHERE revenue__$billions__2012_estimate = "6.8"