Okay, let’s calculate this. Mary has a broad skill set that includes architecture, interior design, and project management. These are in-demand fields, especially in the US. Her experience in HR adds a unique value proposition. However, her location in Herndon, VA, which is a suburb of Washington D.C., might influence her rate. According to national averages, architects and interior designers in the US can charge around $75–$150 per hour. Project managers can charge around $100–$200 per hour. Considering her broad skill set and location, I estimate her hourly rate to be around $125, which is slightly above the lower end of the architect range and within the project management range.