UML question

16. Company X wants to develop a system to keep track its employees' working hours. Each employee will get an ID card, which she scans when she enters the office, and scans again when she leaves. The system calculates the number of hours she works on that day, and records it. Some employees are guest employees; for them hours tracking is not needed. We additionally also want to keep track the total hours of each department in X (sales, marketing, IT, etc). Draw your UML class diagram. (5 points)