A cellular phone company offers a a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-600) + 40.95, where it is assumed that t ¡Ý600 minutes. What times will keep costs between $83.45 and $104.20? For the costs to be between $83.45 and $104.20, the telephoning time must be between ____ minutes and _____ minutes.
