1-

Will cost approximaly $3,000 to cover a roof with shingles with an estimated 20 year life

A better grade shingle hasa 30 year life

Interest rate = 5.4%

How much a better grade shingle will be worth for?

2-

There's 3 buildings from a company.

One is worth $90,000 has a life of 30 years with no scrap value

The second is worth $160,000 has a life of 40 years with a $18,000 scrap value

The third one, is worth $360,000 has a life of 50 years with $40,000 scrap value

Find composite life based on the straight line depreciation method.