Question

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

Answer 1

Area inside the tank = Lateral Surface Area + Floor area

$=2h(l+b)+lb$

$=2\times 3(5+6)+5\times 6$

$=96\text{sq.units}$

So, total cost
$=₹10\times \text{Area inside the tank}$
$=10\times 96$
$=₹960$