| A room is \[12\,\,m\] long, \[8\,\,m\] broad and \[10\,\,m\] high. Find the cost of painting the four walls of the room at \[Rs.\,25per\,{{m}^{2}},\] it being given that the doors and window occupy \[35{{m}^{2}}.\] |
A) Rs. 9315
B) Rs. 9125
C) Rs. 9240
D) Rs. 9065
Correct Answer: B
Solution :
| Area of the four walls of the room is the lateral surface area \[=2lb+2bh\] |
| \[l=12\,\,m,\]\[b=8\,\,m,\]\[h=10\,\,m\] |
| Area of the four walls \[=2\times 12\times 10+2\times 8\times 10\] |
| \[=400\,\,{{m}^{2}}\] |
| Total area to be painted \[=400-35=365\,\,{{m}^{2}}\] |
| Total cost of painting the walls |
| \[=365\times 25=\text{Rs}\text{. 9125}\] |
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