7. Length, breadth and height of a rectangular tank is
25 m, 20 m and 10 m respectively. Find the cost of
painting its outer surface at * 3 per square metre.
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Length of tank = 25 m
Breadth of tank = 20 m
Height of tank = 10 m
Total surface area of tank =
2(lb+bh+hl) = 2( 25×20+20×10+10×25) = 1900sq.m
Cost of painting 1 sq.m. = Rs.3
Cost of painting 1900 sq.m. =
₹(1900×3)= 5700rps
Hence the cost of painting its outer surface at rupees 3 per square metre is Rs.5700
hope it helps....^_^
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