Question

Find the cost of carpenting a rectangular room of dimensions 5m and 3.2 m at the rate of Rs.150 per sq m

Answer 1

Step-by-step explanation:

area of room =l×b

= 5×3.2

= 16 sq.m

cost = rate × area

= 150× 16

= Rs. 2400

Answer 2

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Length, breadth and height of a room are 5m, 4 m and 3 m.

Area of four walls of the room =2h(l+b)

=2×3(5+4) 

=6(9)

=54 sq m

Area of the ceiling =l×b

=5×4

=20 sq cm.

Total area of the four walls and the ceiling of the room

=54+20

=74 sq cm

Cost of white washing = Rs 7.50 per sq m

Total cost of white washing =74×7.50=Rs 555