An electronics company has factories in Cleveland and Toledo that manufacture Blu-ray and DVD players. Each day, the Cleveland factory produces 400 Blu-ray and 350 DVD players at a cost of $18,000. Each day, the Toledo factory produces 200 blu-ray and 500 DVD at a cost of $15,000. An order is received for 25,000 Blu-ray and 21,000 DVD players. For how many days should each factory operate to fill the order at the least cost?.