80 minutes is 40 minutes, 1 is two 40 minutes, and 29 yuan ÷2= 14.5.
14.5 is the price of 40 minutes, 1 hour 60 minutes is the price of 20 minutes, 14.5+( 14.5÷2)=22.
Billiards pricing method: 1 yuan -3 yuan, if calculated by the number of games, by the hour 10 yuan or so; Billiards are generally charged by time, and the prices in major cities in China vary.