Eastern Bank holds assets and liabilities whose average duration's and dollar amounts are as .7 shown in this table Avg. Duration(yrs) S Amount Asset and Liability Items Investment Grade Bonds 3.00 Commercial Loans $75.00 15.00 $500.00 $350.00 6.00 Consumer Loans $450.00 $250.00 2.10 Deposits Non-deposit Borrowings 0.35 a- What is the weighted average duration of Eastern Banks asset portfolio and liability ?portfolio