Question

A tank with length, breadth and height of $5,6$ and $3$ units respectively is open from the top. The cost of anti-microbial coating inside the tank at ₹ 10 per sq. unit is ______.

• A. ₹ 1260
• B. ₹ 660
• C. ₹ 1060
• D. ₹ 960

Answer 1

The correct option is D

₹ 960

Given,
Length, $l=5units$

Breadth, $b=6units$

Height, $h=3units$

$\text{Area inside the tank}$
$=\text{Lateral Surface Area + Floor Area}$
$=2h(l+b)+lb$
$=[2\times 3(5+6\left)\right]+[5\times 6]$
$=[6\times 11]+30$
$=96\text{sq. units}$

Given, cost of anti-microbial coating per sq. unit = ₹ 10
$\therefore$ Total cost of anti-microbial coating
$=96\times ₹10$
$=₹960$