MCQ

The cost of constructing a wall 8 m long, 4 m high and 10 cm thick at the rate of Rs. 25 per m^{3} is

#### Options

Rs. 16

Rs. 80

Rs. 160

Rs. 320

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#### Solution

Dimensions of the wall are,

Length (l) = 8 m

Breadth (b) = 20 cm

= 0.2 m

Height (h) = 4 m

Volume of the hall,

V= lbh

= 8 × 4 × 0.2

= 6.4 m^{3}

Cost of building the wall at the rate of Rs. 25/m^{3},

=25 × v

=Rs. (25 × 6.4)

= Rs . 160

The cost of building the wall is Rs.160 .

Concept: Surface Area of a Cuboid

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