How do you determine the precise painting service cost for a Children's Room in Zurich, considering including ceilings, 2 doors, and 2 windows, with dimensions of 4m x 10m?

Determining the precise painting service cost for a Children's Room in Zurich, considering including ceilings, 2 doors, and 2 windows, with dimensions of 4m x 10m, costs CHF 912.00.

*) 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.