(1):12× 3.14× 55 = 2072.4 (square centimeter)

(12×12+12×16) × 2+12×16 = 869 (square centimeter)

(12 ÷ 2) × 3.14 =113.04 (square centimeter)

12× 16= 192 (square centimeter)

192-113.04 = 78.96 (square centimeter)

78.96+864+2072.4 = 3015.36 (square centimeter)

30 15.36 cm2 =0.30 1536 m2

Answer: You need to brush 0.30 1536 square meters.

(2): 0.301536× 30× 50 = 452.304 (yuan)

A: A * * * costs 452.304 yuan.

I hope I can help you! ~ dear ~O(∩_∩)O~