That's the very rock bottom GT Outpost. Cheapest derailleurs, steel clamp-style seat post, riveted chainrings, nutted axles. A Talera, two or three notches up from this model, in much better shape, is a $25-40 bike. This one is worth more like $15, since the Roadmaster is worth nothing.

Three $40 bikes here -- https://humboldt.craigslist.org/bik/...120975111.html -- the Trek 800 is the pick of the litter. Better equipped than the GT and in much better shape. The RockHopper is just a crying shame.