Let length of square = 100 m and breadth of square = 100 m
Area = (100 x 100) m² = 10000 m²
New length = 130 m and breadth = 120 m

Correct Option: D

Let length of square = 100 m and breadth of square = 100 m
Area = (100 x 100) m² = 10000 m²
New length = 130 m and breadth = 120 m

New area of rectangle = (130 x 120) m² = 15600 m²
Increase % = (5600 / 10000) x 100 % = 56%

Let radius of circle = 100 m
New radius = 101 m
original area = [π x (100)² ]m²
New area = [π x (101)² ]m²

Correct Option: D

Let radius of circle = 100 m
New radius = 101 m
original area = [π x (100)² ]m²
New area = [π x (101)² ]m²
Increase% = [π x {(101)² - (100)²} / { π x (100)²} ] x 100 %
= 201 / 100% = 2.01%

Let side of square = 100 cm
Area = (100 x 100)cm² = 10000 cm²
New area = (130 x 130)cm² = 16900 cm²

Correct Option: D

Let side of square = 100 cm
Area = (100 x 100)cm² = 10000 cm²
New area = (130 x 130)cm² = 16900 cm²
Increase in area = (6900 / 10000) x 100% = 69%

Let the total number of students be 100
Then, n(A ∩ B) = n(A) + n(B) - n(A ∪ B) = (72 + 44 - 100)% = 16%
Now,16% of N = 40

Correct Option: C

Let the total number of students be 100
Then, n(A ∩ B) = n(A) + n(B) - n(A ∪ B) = (72 + 44 - 100)% = 16%
Now,16% of N = 40
⇒ (16 x N) / 100 = 40
∴ N = (100 x 40) / 16 = 250