The following quotes were observed for options on a given stock on November 1 of a given year. These are American calls except where indicated. Assume the stock price was 107.86, the risk-free rates were 6.95 percent (November), 7.14 percent (December) and 7.26 percent (January). The times to expiration were 0.0366 (November), 0.1278 (December), and 0.1914 (January). Assume no dividends unless indicated.