A) Rs. 400
B) Rs. 500
C) Rs. 600
D) Rs. 800
Correct Answer: D
Solution :
[d] Let the depth of the tank be x m. Then,\[4\times 3\times x=24\]\[\Rightarrow \]\[x=2\,m\] Area of the surface to be painted \[=2\times [\{2\times (l+b)\times h\}+(l+b)\}]\] \[=2\times [2\times (4+3)\times 2+(4\times 3)]\,{{m}^{2}}\] \[=80\,{{m}^{2}}\] Cost of painting \[=\text{Rs}.\,(80\times 10)\] \[=\text{Rs}.\,800\] |
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