Minimize cost subject to 1. The number of units shipped from Toronto is not more than 800 2. The number of units shipped from Detroit is not more than 700 3. The number of units shipped to New York is 450 4. The number of units shipped to Philadelphia is 350 5. The number of units shipped to St. Louis is 300 6. The number of units shipped out of Chicago is equal to the number of units shipped into Chicago 7. The number of units shipped out of Buffalo is equal to the number of units shipped into Buffalo

FROM CHICAGO BUFFALO NEW YORK CITY PHILADELPHIA ST. LOUIS SUPPLY Toronto $4 $7 800 Detroit $5 $7 700 Chicago $6 $4 $5 Buffalo $2 $3 $4 Demand 450 350 300