A couple of ancient civilizations invented number systems with place values. The oldest was the Mayan system with 60 at its base, around 3400 BC. The Egyptians invented a 10 base system in 3100 BC. The modern place value system also has 10 as its compression figure.
The national average cost for painting new construction interiors is $3.65 per sq. ft. (heated floor space) that does not include casework like cabinets vanities etc. Repaints do not require the same volume of paint but do have a different set of challenges.
Paint for this room will run about $.20 per square foot of wall space. This will add about $70 to the price above if using a Benjamin Moore high quality paint. Then, sundries, or supplies will be added. They typical cost for this will be about $50 ($.13 per square foot) for a typical room.