Answer:
$5202
Step-by-step explanation:
The total surface area of the cuboidal hall is:
2LB + 2BH + 2LH.
This will be: 2(40*3) + 2(3*15) + 2(40*15)
which will give : 1530m square.
The cost of 25msq of paint is 10
then the cost of 1530 will be 1530x10/25 = 612.
The cost of 1msq of tiles is 3
then the cost of 1530 will be 1530 x 3
= 4590.
Then the total cost will be =$5202