$1.(20$ points$)$ Formulate the Tropicsun fruit transportation problem in Module $3(3-1)$ using a Network Model $($as opposed to the Transportation Model we used in Module $3)$

a$.$Formulate a network model $($LP model$)$ for this problem

b$.$Create a spreadsheet model for the LP model you have in part$-$a and solve it using Solver

c$.$What is the optimal solution? Compare this solution with the solution of the Transportation Model we had in Module $3$