Question

A tank with length, breadth and height of 5, 6 and 3 units respectively is open at the top. Find the cost of anti-microbial coating inside the tank if it is done at Rs. 10 per sq. units.

• A. Rs. 1260
• B. Rs. 1110
• C. Rs. 1060
• D. Rs. 960

Answer 1

The correct option is D

Rs. 960

So, there are five faces which need to be coated.

Surface area of tank = 2(lb + bh + lh) – lb

= 2 (5 $\times$ 6 + 6 $\times$ 3 + 3 $\times$ 5) – 30 sq. units

= 96 sq. units

So, cost of anti – microbial coating = Rs.10 $\times$ 96 sq. units

= Rs. 960