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ICSE Class 8 Answered

The internal length, breadth, and height of an open box are 95cm,75cm and 82m,respectively.If the wood is 2.5cm thick, find the cost of painting the outside of the box at rs1 per dm^3.
Asked by aarohiyadav41534 | 15 Oct, 2019, 07:21: PM
answered-by-expert Expert Answer
Internal dimensions of the box are
length = 95 cm, breadth = 75 cm and height = 82 cm
Outer dimensions of the box are
length = 95 + 2 x 2.5 = 100 cm, breadth = 75 + 2 x 2.5 = 80 cm
height = 82 + 2.5 = 84.5 as the box is open
Surface area of the box = 2(lb+bh+lh) = 2(8000+6760+8450)=46420 cm2
Surface area of the open box = 46420-8000=38420 cm2 = 384.2 dm2
Cost of painting = Rs. 384
Answered by Renu Varma | 18 Oct, 2019, 06:27: PM
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