You Are Considering Buying Carpet for Your University; Grade a Carpet

You are considering buying carpet for your university; Grade A carpet costs $25.25 a square yard and lasts 5 years and Grade B costs $18.25 a square yard and lasts 3 years; Grade C costs $12.10 a yard and lasts 2 years; which carpet should be chosen if the discount rate is 5%? Assume that due to a large endowment given by the state's"carpet king" the university is committed to continued carpet use.Which carpet should be chosen?

A) Grade A
B) Grade B
C) Grade C