find the cost of painting all round outer surface of a box with lid 60 cm long 40 cm wide and 30 cm high at 50 p 20 CM square
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Outer surface area of cuboid =2(lb+bh+hl)
=2(60*40+40*30+30*60)
2(2400+1200+1800)
2*5400=10800cm^2
Cost of paint @50p/20cm^2
10800/20=540cm^2
So cost =540*0.5=270rs
=2(60*40+40*30+30*60)
2(2400+1200+1800)
2*5400=10800cm^2
Cost of paint @50p/20cm^2
10800/20=540cm^2
So cost =540*0.5=270rs
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