Karisma loves to cook. She wants to buy a new electric beater and is considering two models: Model A converts every 1000 J of electrical energy into 600 J of kinetic energy, 300 J of heat, and 100 J of sound. Model B converts every 1500 J of electrical energy into 800 J of kinetic energy, 400 J of heat, and 300 J of sound. Calculate the energy efficiency of the two models and determine which one is more energy efficient.