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_22308881_2 ( in_county_tuition_per_credit_hour__fall_2009_ VARCHAR, college VARCHAR )

### Question ###
How much was the in-county tuition per credit hour at the Mercer College by the fall of 2009?

### Accurate SQL ###

SELECT in_county_tuition_per_credit_hour__fall_2009_ FROM table_22308881_2 WHERE college = "Mercer"