Using the "Transportation Matrix", solve the transportation problem

below using the Northwest Corner and Intuitive Lowest$-$Cost methods.

Use the Northwest Corner method result as the starting point and solve fo

the optimal solution using the Stepping$-$Stone method.

Show all steps and all calculations when doing the Stepping$-$Stone

method.

Northwest Corner method: $20$ pints

Intuitive Lowest$-$Cost method: $20$ points

Stepping$-$Stone method: $60$ points

Total: $100$ points