Penny's car has a 100-liter fuel tank. She starts her trip with the tank full of 89-octane gasoline. After using half of the fuel, she refills the tank with 91-octane gasoline. Later, after using 40 liters of the mixed fuel, she refills the tank to full again with 91-octane gasoline. Penny wants to know how much 89-octane and 91-octane gasoline are in the tank now.