A triangle and a parallelogram are constructed on the same base such that their areas are equal. If the altitude of the parallelogram is 100 m, then the altitude of the triangle is :

Answer: Option D

Let the altitude of the triangle be h₁ and base of each be b.
Then,
$$\frac{1}{2}$$ × b₁ × h₁ = b × h₂, where h₂ = 100 m
⇔ h₁ = 2 h₂
⇔ h₁ = (2 × 100) m
⇔ h₁ = 200 m