 OK, an air conditioner, old one, has an EER of 6. And this was replaced by an EER of 10 air conditioner. The room, basically, is required to pull out 0.75 or 3 quarters of a ton. You should remember that each ton, one ton of refrigeration or air conditioning is equal to basically pulling out 12,000 BTUs every hour. So it is pulling out 3 quarters of a ton, which happens to be 0.75 times 12,000 BTUs per hour, that is 9,000 BTUs per hour. So to pull out 9,000 BTUs per hour with an air conditioner of EER equal to 6, so we are pulling out 9,000 BTUs per hour. And what is the wattage or watts? And wattage is equal to now 9,000 divided by 6. That happens to be 1,500 watts. OK, now if we were to replace this with an EER of 10, air conditioner with 10, now it still has to pull out 9,000 BTUs per hour. And what would be the wattage? So watts equal to now 9,000 BTUs per hour divided by 10. That would be 900 watts. So by replacing this air conditioner, which used to consume 1,500 watts by an energy efficient air conditioner with an EER of 10, we're able to bring down the power consumption to 900 watts. So that's the savings of 40% right there.