Okay, let’s tackle this. So Grace Murphy has 23 years of experience as a Senior Manager in Guam, which is a relatively long tenure. Her role involves medical management, which is a specialized field. Considering her location in West Covina, California, which is a large metropolitan area, and her experience in a specific industry, I would estimate her hourly rate to be on the lower side of the average. Looking at salary benchmarks for healthcare management professionals in the US, I found that the average hourly rate for a Senior Manager with similar experience is around $100-$150 per hour. However, considering the cost of living in California and the fact that Grace is not in a major hub like New York or San Francisco, I will estimate her rate to be around $85 per hour.