4. A continuous electric current of 2,000amps is to be transmitted from a generator to a trans-former located 200 feet away. A copper conductor can be installed for $6 per pound, will have an estimated life of 25 years, and ca be salvaged for $1 per pound. Power loss from the conductor will be inversely proportional to the cross-sectional area of the conductor and maybe expressed as 6.516/A kilowatt, where A is in square inches. The cost of energy is $0.0825 per kilowatt-hour, the interest rate is 11%, and the density of copper is 555 pounds per cubic foot. a. Calculate the optimum cross-sectional area of the conductor. b. Calculate the annual equivalent total cost for the value you obtained in part (a). 2