Question: How much was the in-county tuition per credit hour at the Mercer College by the fall of 2009?
Schema: create table table_22308881_2 (in_county_tuition_per_credit_hour__fall_2009_ varchar, college varchar, PRIMARY KEY (in_county_tuition_per_credit_hour__fall_2009_))
SQL: select in_county_tuition_per_credit_hour__fall_2009_ from table_22308881_2 where college = "mercer"