A new solar-cell unit is to be installed in an office complex at an initial cost of $200,000. It is expected
that the system will generate annual cost savings of $25,000 on the electricity bill. The solar cell unit
will need to be overhauled every 5 years at a cost of $7,000 per overhaul. If the annual interest rate is
12%, find the discounted payback period for the solar-cell unit considering the time value of money.
The costs of overhaul are to be considered in calculating the discounted payback period.
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