A box has Length_36cm, breadth 30 cm
and height 40 cm. find the cost of
painting it from outside at the rate
5 paise per cm².
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Length = 36 cm
breadth = 30 cm
height = 40 cm
total surface area = 2 (lb + bh + lh)
= 2(36×30+30×40+36×40)
= 2 × 3720
= 7440cm^2
rate = paise 5/ cm^2
cost = Rs (7440 × 5 )
= 37200 paise = 37200\100= 372 rupees
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