Final answer:
If the customer does not meet all three achieve checking requirements and the balance goes below $500, there will be a monthly service charge of $15.
Step-by-step explanation:
If the customer does not meet all three achieve checking requirements and the balance goes below $500, there will be a monthly service charge of $15. This information is based on the assumption that the customer is referencing SunTrust Bank's Achieve Checking account, which has specific requirements to avoid service charges.