Okay, let’s tackle this. So Mary Farrell has 22 years of experience as a billing specialist. The industry average for billing specialists in the US is around $25-$40 per hour, depending on experience and location. Since Mary has 22 years of experience, she’s likely above average. However, her role as a Senior Billing Specialist might not command the highest rates. Considering the location is Fonda, Iowa, which is a smaller town, rates might be lower than in major cities. So, I’ll estimate around $40 per hour, which is on the higher end of the average range.