An investor buys 100 shares of Wal- mart at 43.24 per share on margin with an initial margin of 61.76 % and a maintenance margin of 22.73 %. In two months, the stock goes to 64.42. What is the actual margin of the stock when it's at 64.42? Express your answer in decimal notation (e.g., enter 0.0123 to represent 1.23%)