[tex] \boxed{ \mathfrak{\huge \: \underline{ \underline{A nswer} }: }}[/tex]
Given terms :
[tex]\hookrightarrow \: length = 8 \: in[/tex]
[tex]\hookrightarrow \: width = 2 \: in[/tex]
[tex] \hookrightarrow \: height = 12 \: in[/tex]
we know,
[tex] \large\boxed{ \mathrm{surface \: \: area \: (a) = 2(lw + wh + lh)}}[/tex]
[tex]\hookrightarrow \mathrm{\: a = 2 \times \bigg [(8 \times 2) + (2 \times 12) + (8 \times 12) \biggr]}[/tex]
[tex]\hookrightarrow a = 2 \times \biggr[16 + 24 + 96 \biggr][/tex]
[tex]\hookrightarrow \: a = \bigg [\: 2 \times 136\bigg ][/tex]
[tex]\hookrightarrow \large \boxed{ \mathrm{a = 272 \: \: in {}^{3} }}[/tex]
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[tex] \mathrm{✌TeeNForeveR✌}[/tex]
