Find the shortest route from node $1$ to node $7$ in the network shown.

In this homework, please follow the follwoing steps.

$1-$ Identify the decision variables.

$2-$ Formulated the objective function.

$3-$ Formaulate the constraints.

$4-$ Solve the problem using Excel Solver.

$5-$ write down the values of objective functions and decison variables.

Please do every point from $1$ to $5$

Thanks a lot