$\backslash$table$[[$FROM$,10,$sumy$],[$LOS ANGELIS,CALCARY,PANAMA OIY$],[$Mexico Cily,$56,518,58,100],[$Detroin$,817,$$$13,$$$19,60],[$Ottana$,$$$20,$$$10,$$$24,40],[$Demund$,50,80,70,]]$

a$)$ Use the northwest$-$corner method. What is its total cost?

b$)$ Use the intuitive lowest$-$cost approach. What is its total cost?

c$)$ Using the stepping$-$stone meithod, find the optimat sotution Compute the total cost.