An open tank with a rectangular base and vertical sides is to be constructed so as to hold 8000 ...

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An open tank with a rectangular base and vertical sides is to be constructed so as to hold 8000 litres of water. The tank is \( 2 \mathrm{~m} \) deep and material for the bottom costs \( ₹ 1800 \) per square meter and ₹ 900 per square meter for the vertical faces. Based on the above information answer the following questions:
The least cost of construction is
(a) ₹ 14,400
(b) ₹ 7,200
(c) \( ₹ 21,600 \)
(d) ₹ 21,000
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