1 A city has 100,000 homes, each with one refrigerator. The 2001 electricity cost was $0.15/kWh. Referring to the figure in the refrigerators case study, compute how much money was saved in 2001 if all homes had just replaced a 1974 refrigerator with a new refrigerator. 2 An office building in your community has 50 offices, each with an average of four desks. Each desk has a desk lamp that can use either a 60-watt incandescent bulb or a 13-watt fluorescent unit. The average use of a lamp is seven hours per day. How much power is required for the building per year for each of the two options? Given your local energy cost, what is the annual cost of each of the two options? If the price of an incandescent bulb is 88 cents and that of a fluorescent unit is 12 dollars, how long wil take to justify the purchase of fluorescent units, assuming everything is newly purchased