2018//2(b)//Engineering Eco//KU

A large lithium-ion phosphate battery pack for an industrial application is expected to
save $20,000 in annual energy expenses over its 6-year life. For a 3-year simple payback
period, the permissible capital investment is $60,000. What is the internal rate of return
on this $60,000 battery pack if it has a residual value of $10,000 at the end of 6 years?
The MARR is 18% per year.

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2017//2(b)//Engineering Eco//KU

A loan of $10,000 is to be repaid over a period of eight years. During the first four years, exactly half of the loan principal is to be repaid (along with accumulated compound interest) by a uniform series of payments of A1 dollar per year. The other half of the loan principal is to be repaid over four years, with accumulated interest, by a uniform series of payments of A2 dollar per year, If i=9% per year, what are A1 and A2?

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