Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of $Rs7.50per{m}^2$

Answer 1

Area of walls $=2h(l+b)$

Area of ceiling $=lb$

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

$=2\left(3\right)\left(9\right)+20=74m^2$

Total cost = $7.50\times 74=555$ Rs.