Question

The Length breadth and height of a hall are 5, 6, and 7 metre respectively the hall has one door of area 1 metre × 0.5 metre find the cost of painting the walls only the walls at the rate of rupees 90 per square metre

Answer 1

Step-by-step explanation:

Cost of paintinh only the walls of hall=(lateral surface area of hall - area of door)*cost per sq.m.

= {2h(l+b) - l*b(of door)]*cost per sq.m.

={2*7(5+6) - (1*0.5)]*90

=[14(11) - (0.5)]*90

=[154-0.5]*90

=(153.5)*90

=13,815

=Rs.13,815

So, cost of painting only wall is Rs.13,815