An Open Box is Made of Wood 3 Cm Thick. Its External Length, Breadth and Height Are 1.48 M, 1.16 M and 8.3 M. Find the Cost of Painting the Inner Surface of Rs 50 per Sq. Metre. - Mathematics

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An open box is made of wood 3 cm thick. Its external length, breadth and height are 1.48 m, 1.16 m and 8.3 m. Find the cost of painting the inner surface of Rs 50 per sq. metre.

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Length =1.48m=148cm.
Breath =1.16m =116 cm 
Height = 8.3m = 83cm
Thickness of wood = 3cm
∴ inner dimensions:

Length (148 - 2 x 3)cm = 142cm

Breadth (116 - 2 x 3) cm = 110cm

Height= (83 - 3) cm = 80cm.

Inner surface area = 2 (l + b) + lb




Hence, cost of painting inner surface area




Concept: Surface Area of a Cuboid
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RD Sharma Mathematics for Class 9
Chapter 18 Surface Areas and Volume of a Cuboid and Cube
Exercise 18.1 | Q 13 | Page 14

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