Question

if the length and breadth of the floor of the hall are 40 metre and 30 metre respectively and its height is 10 metre find the cost of the painting the four walls at the rate 15 per square metre​

Answer 1

Answer:

₹21000

Step-by-step explanation:

l = 40m

b = 30m

h = 10m

now 4 walls means the lateral surface are of cuboid.

so lsa = 2(lh + bh)

lsa = 2(40 * 10 + 30 * 10)

lsa = 2( 400 + 300)

lsa = 2 * 700

lsa = 1400m2

now cost = 1400 * 15

= ₹21000