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Subject
Topic
Level
Highschool
Grade
8

Answer

249 sq. Inches

Steps

The box has got 2+2+1 surface areas to be coated.

The surface  areas are 

2×(9in×3in)+2×(13in×3in)+1×(13in×9in)

= (2×27)+(2×39)+1×(117) sq inches.

= 54+78+117 = 249 sq inches.

 

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