Question

room is 40 m long, 30m broad and 10m high. find the cost of white washing it's four wall and ceiling at @20/-per square m​

Answer 1

Answer:@52000

Step-by-step explanation:

L=40 B=30 H= 10

Area of 4 walls = 2(l+b)h

Area of rec. = l×b

Area of 4 walls+area of rec. =

2(40+30)×10 + 40×30

=140×10 + 1200

=1400+1200

=2600m²

Cost of washing 1m²= @20

Cost of washing 2600m²

= 2600×20

=@52000