Correct Answer - Option 3 : 256

**Given:**

Area of the rectangle = 960 sq. cm

Length/Breadth = 15

**Formula Used:**

Area of rectangle = lb

Perimeter of rectangle = 2(l + b)

**Calculation:**

Area of rectangle = lb

⇒ lb = 960 ….. (i)

Also, l/b = 15

⇒ l = 15b

Put this value in the equation (i), we have-

⇒ (15b)b = 960

⇒ 15b^{2} = 960

⇒ b^{2} =64

⇒ b = √64

⇒ b = 8 cm

So, l = 15b = 120 cm

**Perimeter of rectangle = 2(l + b)**

⇒ 2(120 + 8)

⇒ 2× 128

⇒ 256 cm

**∴ Perimeter of the rectangle is 256 cm.**