A tank with rectangular base and rectangular sides, open at the top...

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A tank with rectangular base and rectangular sides, open at the top is to be constructed so that its depth
\( \mathrm{P} \) in \( 2 \mathrm{~m} \) and volume is \( 8 \mathrm{~m}^{3} \). If building of tank costs rupees 70 per sq. metre for the base and rupees

W 45 per sq. metre for sides, what is the cost of least expensive tank?
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