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

You are considering buying carpet for your university; Grade A carpet costs $17.10 a square yard and lasts 5 years and Grade B costs $12.50 a square yard and lasts 3 years; Grade C costs $8 a yard and lasts 2 years; which carpet should be chosen if the discount rate is 10%? 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