Length of room = 4.9 m
Breadth of room = 3.5 m
Margin = 25 cm = 0.25 m
Breadth of carpet = 80 cm = 0.8 m
Cost = ₹ 80 per meter
Now,
Length to be carpeted = 4.9 m – (0.25 + 0.25) m = 4.4 m
Breadth to be carpeted = 3.5 m – (0.25 + 0.25) m = 3 m
Therefore,
Area to be carpeted = Length to be carpeted X Breadth to be carpeted
= 4.4 × 3
= 13.2 m2
Area of carpet = Area to be carpeted = 13.2 m2
Now,
Lengthof carpet = (area of carpet) / (breadth of carpet) = 13.2/0.8 = 16.5
Length of carpet is 16.5 m
Now,
Cost of 1 m carpet = ₹ 80
Therefore,
Cost of 16.5 m carpet = ₹ 80 × 16.5 m = ₹1,320