A rectangle has 30 cm as its length and 720 sq cm as its

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A rectangle has 30 cm as its length and 720 sq cm as its area. Its area is increased to 1¹/₄ times its original area by increasing only its length. Its new perimeter is

1. 123 cm
2. 125 cm
3. 119 cm
4. 121 cm
5. None of the above

Correct Option: A

Original breadth of rectangle = 720/30 = 24 cm
Now , area of rectangle = (5/4) x 720 = 900 cm²
∴ New length of rectangle = 900/24 = 37.5 cm
∴ New perimeter of rectangle = 2(l+ b)
= 2(37.5 + 24 )
= 2 x 61.5
= 123 cm