Based on the provided skills, I've considered the general rate for customer service and sales professionals in the United States. According to national averages, customer service representatives can earn around $25-$35 per hour, while sales professionals can earn $40-$60 per hour. Management skills add a premium, potentially bringing the rate to $60-$80 per hour. However, accounting skills like invoicing and inventory management may bring the rate down slightly. Considering Marci's diverse skillset, I've estimated her hourly rate to be around $50, which is on the lower end of the management spectrum but still reflective of her overall value.