MASSACHUSETTS - Commuters who depend on public transportation could soon pay nearly 20 percent more to ride buses, trains, and trolleys under a wide-ranging fare proposal unveiled yesterday, little more than a week after the state provided an infusion of $160 million to help the state's transit agency.

The proposal includes a broad array of increases that would bring in an estimated $69 million a year and affect everyone who uses public transportation, from the suburban resident who takes commuter rail once a month to the city resident who depends on a monthly bus or subway pass for all local travel.

Advocates have warned that higher prices will drive people away from public transit when the Massachusetts Bay Transportation Authority is struggling to retain riders who turned to the T when gas prices spiked last summer.

``I'm disgusted, but not surprised,'' said Tony Costello, a healthcare worker who was riding the Red Line yesterday. ``They are totally mismanaged. . . . They're pricing themselves out of business. It's absolutely ridiculous.''

The proposed fare increase will be the subject of 13 public workshops and hearings in August and would then have to be voted on by the MBTA board of directors. The proposal includes no specific date for a fare increase, and MBTA spokesman Joe Pesaturo could not specify a possible timeline.

Despite the additional money from the state, provided by an increase in the sales tax, transportation officials had warned in recent weeks that a fare increase was a near certainty, given the transit agency's long-term debt problems. Yesterday's release came in an afternoon e-mail and without comment from the T general manager, Daniel A. Grabauskas, or the chairman of its board, Transportation Secretary James A. Aloisi Jr.