A rectangular water tank is open at the top. Its capacity is 24Cu.m.It's length and breadth are 4m and 3m respectively. Ignoring the thickness of the material used for building the tank the total cost of painting the inner and outer surface of the tank at Rs. 10 per Sq.m is
Options:
A . Rs.400
B . Rs.500
C . Rs.600
D . Rs.800
Answer: Option D
Let the depth of the tank be x meters, then 4x 3 × x =24. => x =2m Area of the surface to be pointed = 2 x [{2 x (l +b) x h} + (l x b)}] = 2 x [2 x (4+3) x 2 + (4+3)]Sq.m = 80 m2 Cost of pointing =Rs. (80 x 10) =Rs. 800/-
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