Correct option is (b) 12
The table will have the dimensions, length = 4 − 2(0.25) = 3.5m
Breadth = 2 − 2(0.25) = 1.5m
Area of the table top = l × b
= 3.5 × 1.5
= 5.25 m2
Cost of polishing the top of the table at Rs 2.25 per square meters
= Rs2.25 × 5.25
= Rs.11.8125
= Rs.12