You have been hired as a risk manager for Acorn Savings and Loan. Currently, Acom's balance sheet is as follows (in millions of dollars): Assets Liabilities Cash reserves 50.4 Checking and savings 80.9 Auto loans 98.3 Certificates of deposit 100.7 Mortgages 152.1 Long-term financing 100.9 Total Assets 300.8 Total liabilities 282,5 Owner's equity 18.3 Total liabilities and equity 300.8 When you analyze the duration of loans, you find that the duration of the auto loans is 1.9 years, while the mortgages have a duration of 6.8 years. Both the cash reserves and the checking and savings accounts have a zero duration. The CDs have a duration of 21 years, and the long-term financing has a 9.2-year duration a. What is the duration of Acorn's equity? b. Suppose Acom experiences a rash of mortgage prepayments, reducing the size of the mortgage portfolio from $152.1 million to $101.4 million, and increasing cash reserves to $101.1 million. What is the duration of Acorn's equity now? If interest rates are currently 4% and were to fall to 3%, estimate the approximate change in the value of Acorn's equity. (Assume interest rates are APRs based on monthly compounding.) c. Suppone that after the prepayments in part (b), but before a change in interest rates, Acorn consider managing its risk by selling mortgages and/or buying 10-year Treasury STRIPS (zero coupon bonds) How many should the firm buy or sell to eliminato its current interest rate risk