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,$$$8,120],[$Detroit$,$$$17,$$$13,$$$19,70],[$Ottawa$,$$$20,$$$10,$$$24,50],[$Demand$,80,100,60,]]$

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

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

$\backslash$table$[[\backslash$table$[[$From$],[$Mexico City$]],$To$,$Supply$],[$Los Angeles,Calgary,Panama City$],[,$$$6,,$$$18,,$$$8,120],[80,,40,,0,,120],[$Detroit$,0,$$$17,60,$$$13,,$$$19,70],[$Ottawa$,,$$$20,,$$$10,,$$$24,],[$Clawa$,0,,0,,,,30],[$Demand$,80,,100,,60,,]]$