An electrical contractor pays his subcontractors a fixed fee plus mileage for work performed. On a given day thecontractor is faced with three electrical jobs associated with various projects. Each subcontractor will have enoughtime to work on up to two projects during the day. Each project should be completed by exactly twosubcontractors. Given below are the distances between the subcontractors and the projectsProjectsSubcontractorA B CWestside 2 3 4Federated 6 1 5Goliath 5 6 6Universal 112 3a. Draw a network to represent the possible subcontractor-project assignments.b. Develop a linear model which would be used to minimize total mileage costs.?