Val returned a bicycle while she was on vacation. She paid a flat rental fee of $55.00 plus $8.50 each day. The total cost was $123. How many days did she rent the bicycle?

8 days

Step-by-step explanation:

The total cost includes $55 flat rental fee which is one time cost only as not given everyday so we subtract it from $123 and divide $ (123-55) with per day cost that is $8.50 which gives 8 as answer so Val spent 8 days on vacation.