A rectangle has 15 cm as its length and 150 cm2 as its

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A rectangle has 15 cm as its length and 150 cm² as its area .Its area is increased to 1¹ / ₃ times the original area by increasing only its length . Its new perimeter is ?

1. 50 cm
2. 60 cm
3. 70 cm
4. 80 cm

Correct Option: B

Breadth of the rectangle = (150/15) cm
= 10 cm

New area = (4/3 x 150) cm²
= 200 cm²

New length = 200/10 cm
=20 cm

New perimeters = 2(20 + 10) cm
= 60 cm