Problem 23-16 A manager is holding a bond portfolio worth $21 million with a modified duration of 9 years. She would like to hedge the risk of the portfolio by short-selling Treasury bonds. The modified duration of T-bonds is 11 years. How many dollars' worth of T-bonds should she sell to minimize the variance of her position? (Enter your answer in dollars not millions rounded to the nearest dollar value.) Dollars' worth of T-bonds to be sold