Question

the floor of a rectangular hall has a perimeter of 236 metre its height is 4.5 M find the cost of painting its four walls doors and windows be ignored @ rupees for 8.40 per square metre

Answer 1

given perimeter of rectangle= 236m  height= 4.5m  find area of four walls

perimeter of rectangle = 2(l+b)
236 = 2(l+b)

calculate area of four walls we have to calculate curved surface area

= 2(l+b)h

= 236*4.5

= 1062 sq. metre

1 sq. metre cost = Rs 8.40

then cost of 1062 sq. metre = Rs 1062 * 8.40

                                             = Rs 8920.80