An electronics company has factories in Cleveland and Toledo that manufacture Bluray and DVD players. Each day, the Cleveland factory produces 500 Blu-ray and 300 DVD players at a cost of $18,000. Each day, the Toledo factory produces 300 of each type of player 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?