A room is 15 ft long and 12 ft broad. A mat has to be placed on the floor of this room leaving 1.5 ft space from the walls. What will be the cost of the mat at the rate of Rs.3.50 per square feet?

Correct option is D

Given:
Room dimensions: 15 ft long, 12 ft broad, Mat leaves 1.5 ft from walls
Formula Used:
Area of the mat = (Length - 2 × Margin) × (Breadth - 2 × Margin)
Solution:
Mat area = (15 - 2× 1.5) × (12 - 2× 1.5) = 12 × 9 = 108 sq ft
Cost = 108 × Rs. 3.50 = Rs. 378