Main Street Bank Has $100 Million in Commercial Loans with an Average

Main Street Bank has $100 million in commercial loans with an average duration of 0.40 years;$40 million in consumer loans with an average duration of 1.75 years;and $30 million in U.S.Treasury bonds with an average duration of 6 years.What will be the bank's dollar-weighted asset portfolio duration?

A) 0.4 years
B) 1.7 years
C) 2.7 years
D) 4.1 years
E) None of the options is correct.