Find an initial solution to the following transportation problem for Supply Chain Manager Gabriela Valdez.

$\backslash$table$[[,$To$,],[$From$,$Los Angeles,Calgary,Panama City,Supply$],[$Mexico City,$$6,$$$18,$$$8,100],[$Detroit$,$$$17,$$$13,$$$19,60],[$Ottawa$,$$$20,$$$10,$$$24,40],[$Demand$,50,80,70,]]$

The starting solution using northwest$-$corner method is:

$($Note: You must enter a shipment in every cell, even if the shipment is $0.$