39. Balabala Supermarket has received many Magic Eggs, which are packaged in large and small baskets. Each large basket holds 150 Magic Eggs, and each small basket holds 80 Magic Eggs. If all the Magic Eggs are sold at the set price, the total revenue would be 1366.40 yuan. If the price of each Magic Egg is increased by 2 fen, the total revenue would be 1415.20 yuan. If there are more large baskets than small baskets, then Balabala Supermarket has a total of $\qquad$ large baskets.
$12$