Question

If the dimension of a rectangular room are 10 m × 12 m × 9m,then the cost of painting it's 4 walls at the rate of ₹8 per m² is​

Answer 1

Step-by-step explanation:

we know the lateral surface area or are of four walls of a rectangular room is

=2h(l+b)

=2×9(10+12)

=18×22

=396m^2

Now, cost of painting is ₹8 per m^2

cost of painting 4walls of the room= 396×8

=₹3168

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