Question

an open box is made of wood 3 cm thick. its external length,breadth and height are 1.46m,1.16m and 8.3dm respectively.what is the cost of painting the inner surface of the box at 50p per 100cm²

Answer 1

Explanation: Internal length

`= (146 - 6) cm = 140 cm,`

Internal breadth

`= (116 - 6) cm`

`= 110 cm.`

Internal depth

`= (83 - 3) cm`

`= 80 cm.`

:. Area of inner surface

`= [2 (l + b) x h] + lb`

`= [2 (140 + 110) x 80 + 140 x 110] sq. cm`

`= 55400 sq. cm.`

Cost of painting `= Rs. (1/2 x 1/100 x 55400)`

`= Rs. 277`

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