The floor of a rectangular room is 21 m long and 12 m wide. The room is surrounded by a veranda of width 2 m on all its sides. The area of the veranda is :  Choose the correct choice from the following answers:	A) 124 m 2	B) 128 m 2	C) 138 m 2	D) 148 m 2	E) none of these

Rationale: "area of the outer rectangle = 25 ã — 16 = 400 m 2 area of the inner rectangle = 21 ã — 12 = 252 m 2 required area = ( 400 â € “ 252 ) = 148 m 2 answer d"
Answer: D