The current lighting in your house consists of 6 100W incandescent light bulbs, 8 75W incandescent light-bulbs and 8 23W compact fluorescent light-bulbs. These lights are on an average of 6 hours a day. Electricity costs $0.15 per kW/hr delivered to your house. What is the monthly cost (assume 30 days a month) to operate these lights? How much would be saved by replacing the incandescents with CFLs? If the bulbs cost $10 apiece, what is the payback period in months?