The fifth grade, the second volume of mathematics, accompanied me to learn the answers every day, page 37, question 2, page 4 1, page 42.
Internal area =2(5*4+5*3+4*3)=94 square decimeter.
Outer area = 2 (5.4 * 4.4+5.4 * 3.4+4.4 * 3.4) =114.16 square decimeter.
* * * Need to brush 208. 16 square decimeter.