5. Find the cost of painting all round the outer surface of a box with lid 100 cm long, 80 cm wide and 60 cm
high at rupees 2 per 40 cm sq.
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Answer:
940 Rs
Step-by-step explanation:
total surface are of box is
s.a.=2(100×80 + 100×60 + 80×60)
= 18800
cost= S.A.×cost/40
=18800×2/40
=940 Rs
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