I'll guess the garage to be approximately 24'x24' with a 16" overhang and 4/12 pitch:
29 gauge colored steel with ridge cap, corner trim, gutter apron , bottom closure, vented ridge closure, 1x4 nailers, roof screws, 4" torx screws for 1x4 fastening= ballpark $1,850
Judging by the cinder...