Question

the dimension of the room is 4 metre into 5 into 4 metre find the area of four walls and find the cost of painting the four walls at Rs 100 m square​

Answer 1

c.s.a

$= 2(l + b) \times height \\ 2(5 + 4) \times 4 \\ 2 \times 9 \times 4 = 72 { }^{2} \\ cost = area \times rate \\ 72 \times 100 = 7200m$