The cost of constructing a wall 8 m long, 4 m high and 20 cm thick at

1.	The cost of constructing a wall 8 m long, 4 m high and 20 cm thick at the rate of Rs. 25 per m3 isA. Rs. 16B. Rs. 80C. Rs. 160D. Rs. 320
Answer» Correct option is C. Rs. 160 Given, Length of wall = 8m Breadth of wall = 4 m Thickness of wall = 20 cm = \(\cfrac{20}{100}m\) Volume of wall = \(l\times b\times h\) = 8 \(\times4\times\cfrac{20}{100}\) = \(\cfrac{32}5m^3\) ∵ cost of construction of 1m³ wall = Rs. 25 ∴ cost of construction of \(\cfrac{32}5\)m³ wall = \(\cfrac{32}5\times25\) = Rs. 160

The cost of constructing a wall 8 m long, 4 m high and 20 cm thick at the rate of Rs. 25 per m3 isA. Rs. 16B. Rs. 80C. Rs. 160D. Rs. 320

Answer»

Correct option is C. Rs. 160

Given,

Length of wall = 8m

Breadth of wall = 4 m

Thickness of wall = 20 cm = \(\cfrac{20}{100}m\)

Volume of wall = \(l\times b\times h\) = 8 \(\times4\times\cfrac{20}{100}\) = \(\cfrac{32}5m^3\)

∵ cost of construction of 1m³ wall = Rs. 25

∴ cost of construction of \(\cfrac{32}5\)m³ wall = \(\cfrac{32}5\times25\) = Rs. 160