Okay, let’s tackle this. So Martha has 28 years of experience as an interior designer, which is a significant amount. Location is Greenville, SC, which is a mid-sized city. Industry demand for interior designers is steady, but not extremely high. Skills like Autocad, design research, and space planning are in demand, but not extremely rare. Certification from NCIDQ adds credibility. Considering these factors, I’ll estimate her rate to be around $125 per hour, which is below average for an interior designer with her experience. Some interior designers with similar experience in larger cities might charge $200–$300 per hour, but Martha’s location and certification keep her rate lower.