Height: 4-1.1= 2.9m.

(8 * 6+6 * 2.9+2.9 * 8)* 2-8 * 6-4 * 1.2-25 = 109.4 m2。

Paint cost of a classroom: 109.4*55=60 17 yuan. How much is it a year: 60 17/5= 1023.4 yuan?

109.4*37=4047.8 yuan, which is about 1349.3 yuan.

How much is it to paint (12) the classroom?

109.4 *12 * 55 = 72204 yuan.

Request painting area:

(1.1* 8+6 *1) * 2 = 30.8 square meters 30.8* 12=369.6 square meters.

How much paint is used:

369.6*0.25=98.4 kg, about 99 barrels, 99*35=3465 yuan.

Labor cost:

12/4=3 days 12/6=2 days 3*50+30*2=2 10 yuan.

How much is a * * *?

72204+3465+2 10=75879 yuan

It is appropriate to buy a bucket of 55 yuan paint. Maybe so. The calculation may not be accurate.