Hi, can someone please help me with this network flow problem

For ead) of the questions, draw the associated network and label the nodes and ares with the appropriate quantities (supply, demand, lower bound, upper bound, unit cost). You do not need to provide any mathematical formulations in these questions. All questions are from the 4th edition of (10 points) Workco must have the following number of workers available during the next three months: month 1, 20; month 2, 16; month 3, 25. At the beginning of month 1, Workco has no workers. It costs Works) $100 to hire a worker and $50 to re a worker. Each worker is paid a salary of $140/month. Formulate the problem of determinjng a hiring and ring strategy that minimizes the total cost incurred during the next three months as a MCNF