please help me solve this chrolonogically as numbered

A concrete company in Kasoa transpats concrete from their three plants in Nyanyano, Feteh and Tuba to their three construction sites in Ofaakor, Papaase and Krodua. The supply capacities of the three plants, the demand requirements at the three sites, and the transportation costs per ton are as follows: Construction Site Plant Ofaakor Papaase Krodua Supply(tons) Nyanyano GHS 8 GHS 5 GHS 6 GHs 120 Feteh 15 10 12 80 Tuba 3 9 10 Demand(tons) 150 70 100 280 a) Establish the decision variables for this transportation problem (3 Marks) b) Develop a network graph showing all costs and decision variables. (7 Marks) c) i. Formulate the mathematical model that will be used to solve the problem on a computer 80 3 ii. Fine the initial feasible solution using the Northwest Comer Rule and the total cost (10 Marks)