Companies A$,$ B$,$ and C supply components to three plants $($F$,$ G$,$ and H$)$ via two crossdocking facilities $($D and E$).$ It costs $$4$ to ship from Dregardless of final destination and $$3$ to ship to E regardless of supplier. Shipping to D from A$,$ B$,$ and C costs $$3.$ $$4,$ and $$5,$ respectively, and shipping from E to F$,$ G$,$ and H costs $$10,$ $$9,$ and $$8,$ respectively. Suppliers A$,$ B$,$ and C can provide $200,300$ and $500$ units respectively and plants F$,$ G$,$ and H need $350,450,$ and $200$ units respectively. Crossdock facilities D and E can handle $600$ and $700$ units, respectively. Logistics Manager, Aretha Franklin, had previously used "Chain of Fools" as her supply chain consulting company, but now turns to you for some solid advice. How many decision variables are in this problem? Oo oo