According to the Container Recycling Institute, after peaking at 65% in 1992 , domestic aluminum beverage can recycle in 2003 in the U.S. dropped to 44%. In 2004-06, it maintained at 45%, marking 6 consecutive years it has been less than 50% after 16 years over 50% (see figure). About 100 billion aluminum beverage cans were produced in 2006 in this country. It takes 150kWh to make one pound of aluminum from bauxite, and only 5% of that energy to produce cans from recycled aluminum. Comprerce, NB Svencke Rorurptet O Conanimer Perweling inariNuin, 2003 a. If a can weighs 1/2 ounce each, about how many tons of aluminum were recycled in 2006? | b. What are the annual energy savings from recycling these cans in GWh? c. What are the end-use energy savings in equivalent barrels of oil (bge)? What are the primary energy savings in barrels of oil (assume electricity is coal generated)? For the purrose of this calculation, the following conversion factors are used. 0.00054 short tons of coal needed to generate 1kwh J. electricity - 172 Mbar = 1 QRtu ( Table 4.1) 19,336,000 Btu per 1 short ton coal according to the information from here. (How much coal, natural gas, or petroleum is used to generate a kWh of electricity