2. Advertisements in peak hours: 5 advertisements in each prime time period X4 time period =20 advertisements. Because it is a prime-time advertisement, the unit price should be higher. 0.2 yuan is calculated as 20 advertisements X0.2 yuan/day/car =4 yuan. According to the calculation of 30 days per month, each car plays 30*20=600 advertisements, and the cost is 30*4= 120 yuan per car.
3. quasi-nodding advertisement: 0.25 yuan per hour during the day 12 hours. 12 piece hour X0.25 yuan/day/car =3 yuan. According to the calculation of 30 days per month, each car plays 30* 12=450 advertisements, and the cost is 30*3=90 yuan/car.
4. Headline advertisement of weather forecast: 4 times a day, each time calculated as 0.5 yuan. Four weather forecasts X0.5 yuan/day/car =2 yuan. 30 days a month, each car broadcasts 30*4= 120 advertisements, and the cost is 30*2=60 yuan/car.
The above four kinds of advertisements are monthly taxi advertising expenses, totaling 600+600+450+120 =1770 articles/month/car, and the monthly expenses are 60+ 120+90+60=330 yuan/month/car, and other advertisements are ignored.