Energy management

Question 1 There are 20 lights and ballasts that consume 440W (400W high intensity discharge (HID) bulbs with a ballast that consumes 40W). The cost of electricity is $0.10/kWh and $7/KW-month demand and the lights are on 24 hours a day, seven days a week. How much electricity do the HID lights and ballasts consume monthly? What is the estimated cost of operating the 20 HID lights and ballast monthly