This is an easy question to hate, but can anyone give a range of cost for coming in and flexible ducting a very simple structure?

Hung on the outside wall is a package heat cool unit. 60m btu. standard York rig.

All work on one level attic surface, flat floor, ducts laying in the corner where rafters meet the floor.

One return air run to the filter grille about 30 feet long

5 or six air outlets totalling about 80 feet of smaller duct off the main plenum.

Would have to supply the square to round transition off the installed hvac unit.

Its a rental, one floor, 24 x 46 feet footprint. simple box. You can stand up in the attic easily and it has a standard staircase acess.