Calculate the reverberation time in seconds at 500 Hz for a conference room that is 13.3 feet wide, 22.2 feet long, and 11.1 feet high. It has a carpeted floor, curtains on both long sides, plasterboard short sides and a plasterboard ceiling. The conference room is also occupied by 20 people in comfortable upholstered seats.

Calculate the reverberation time in seconds at 500 Hz for a conference room that is 13.3 feet wide, 22.2 feet long, and 11.1 feet high. It has a carpeted floor, curtains on both long sides, plasterboard short sides and a plasterboard ceiling. The conference room is also occupied by 20 people in comfortable upholstered seats.