Since one of the duties of educators is to engage and familiar with children, when they are assigned to supervise one room, they will stay in the same room for the whole week. The Centre Manager, Joan Gilmore, wants to create a roster for the educators with a minimum cost plan. She wants the plan that (1] each permanent educator will be given a job to do and (2) in case that there are not sufficient educators, an agency educator will be given a job: ai Formulate and imolement the mathematical model to solve this