The length, breadth, and height of a cuboidal room are given as 80 m, 70m, and 80 m, respectively. What will be the total cost of painting the four walls of this room, at the rate of 50 paise per square metre?

The length, breadth, and height of a cuboidal room are given as 80 m, 70m, and 80 m, respectively.

Total area of four walls = $$2\left(length+breadth\right)\times\ height$$

= $$2\left(80+70\right)\times\ 80$$

= $$2\times150\times80$$

= 24000 square metre

Total cost of painting the four walls of this room, at the rate of 50 paise per square metre = $$24000\times 0.5$$ [1 rupee = 100 paise, So 0.5 rupee = 50 paise]

= ₹12000