Question

5. The floor of an auditorium has a perimeter of 300 m. If its height is 8 metre, find
the cost of painting its four walls at the rate of Rs.16 per square metre.​

Answer 1

Answer:

Rs.38,400

Step-by-step explanation:

It is given that

p=300m

h=8m

a of 4 walls=300*8 sq.meters

                 =2400sq.meters

cost of painting=Rs.16 PER SQ.METER

total cost=Rs.2400*16

              =Rs.38,400

Answer 2

Answer:

The cost of painting the four walls is Rs.38,400

Step-by-step explanation:

Let the four sides of the auditorium be S1, S2, S3 and S4

Sum of areas of four walls = S1*h + S2*h + S3*h + S4*h

                                            = (S1+S2+S3+S4)*h

                                             = Perimeter * height

From the values given, the area of the four walls is:

300 * 8 sqm

= 2400 sqm

Cost of painting is Rs.16 per sqm

Total cost of painting = Total area * Rate

                                    = 2400 * 16

                                    = 38400