I need Procedures!!

Company transport raw material from three different manufacturing plants to three warehouses. The supplies and demand requirements at the three plants and warehouses, and the transport cost per unit of raw material are as follows. Warehouses Plants 1 X Y NN Supply 100 1 1 2 2 1 90 N 3 5 6 7 80 Demand 125 60 70 a. Determine the initial tableau using the minimum costs method. b. Construct the initial tableau using the Voguel method. c. Solve the problem using the U-V method and the minimum costs method. d. Decide how the raw material should be transport with a minimum cost Z. e. In this problem what is the meaning of the dummy