Try creating another item in the query:
IF (MEMBER STATUS='ACTIVE') THEN (1) ELSE (0) and call it ACTIVE STATUS
Set the aggregation rule on this and the MEMBER STATUS item to COUNT. This will give you only one row with 2 numbers - the count of members and the count of active members.
On the page create a layout calculation something like ACTIVE STATUS / MEMBER STATUS. This will create a third item on the row which is the percentage of active members.
Hope that helps.

Blue