. A rectangular sheet of aluminium foil measuring 5 cm by 10
cm is rolled into a cylinder of height 10 cm. If the cost of
painting the cylinder is Rs. 2/- per sq.cm., then the cost
of painting the outer surface of the cylinder will be
(a) Rs. 400/-
(b) Rs. 200/-
(c) Rs. 150/-
(d) Rs. 100/-
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(d) Rs. 100/-
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