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Question: 5 an existing electrical power line needs to have its...

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5. An existing electrical power line needs to have its capacity increased, and this can be done in either of two ways. The First Method is to add a second conductor to each phase wire, using the same poles, insulators, and fittings, at a construction cost of $15,000. The Second Method for increasing capacity is to build a second line parallel to the existing line, using new poles, insulators, and fittings, at a construction cost of $23,000. At some time in the future, the line will require another increase in capacity, with the First Method now requiring a second line at a cost of $32,500, and the Second Method requiring added conductors at a cost of $23,000. If the interest rate is 6%, how many years between the initial expenditure and the future expenditure will make the First Method and the Second Method economically equal?

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