Let $T = w(r)$ give the total number of minutes of radio advertising bought in a month by a small company as a function of the rate $r$ in dollars per minute. Rates vary depending on the time of day the ad runs, ranging from $25 to $85 per minute. The company's monthly radio advertising budget is $2550. Find the domain and the range of the function $T = w(r)$, assuming that all of the money in the advertising budget is spent.

Domain: help (inequalities)
Range:   help (inequalities)