What is the total number of work hours reported by employees in the Sales department?

A survey was conducted in a company to determine the distribution of work hours among employees in three departments: Sales, Marketing, and Operations. The total number of employees surveyed is 300. The data collected is as follows: Sales Department: 120 employees Marketing Department: 90 employees Operations Department: 90 employees The average number of work hours per week reported by employees in each department is as follows: Sales: 45 hours Marketing: 40 hours Operations: 38 hours