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CBSE Class 9 Answered

Find the cost of painting the four walls and ceiling of a room at the rate of Rs 14 per m2, if perimeter of the base with equal sides is 80 m and height of the room is 9.5 m.
Asked by Topperlearning User | 23 Aug, 2017, 12:55: PM
answered-by-expert Expert Answer

Perimeter of a square shaped floor=80 m

4a=80

rightwards double arrowa=20m

Thus, length (a) =20 m, breadth (a) =20 m and height (h)=9.5 m

Area of four walls and top

begin mathsize 12px style 2 open parentheses straight a plus straight a close parentheses straight h plus straight a squared equals 2 open parentheses 20 plus 20 close parentheses cross times 9.5 plus 20 squared equals 1160 space straight m squared end style

                                                      

                                                  

Cost of painting 1 m2 = Rs 14

Therefore, cost of painting 1160 m2 =Rs {1160×14}=Rs 16240

Answered by | 23 Aug, 2017, 02:55: PM

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