Answer:
136
Explanation:
The method is 2lw x 2lh x2wh
2x8x4
2x8x3
2x4x3
= 136
The box has 6 sides. 2 each of 8 x 9, 8 x 12 and 9 x 12 ie 2 x (72 + 96 + 108) ie 2 x 276 which is 552 sq ins.
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