How do you calculate the painting expenses for a Living Room in Bern, excluding ceilings, 1 doors, and 1 windows, measuring 7m x 3m?

Meticulously calculating the painting expenses for a Living Room in Bern, excluding ceilings, 1 doors, and 1 windows, measuring 7m x 3m, should cost you around CHF 308.00.

*) The calculations are approximate, based on a room height of 2.4m, and include one coat of paint. The price covers only the labor, excluding any services or materials.