If 15% of (A + B) = 25% of (A - B), then what percent of B equal to A ?

Answer: Option D

$$\frac{15}{100}$$ (A + B) = $$\frac{25}{100}$$ (A - B)
⇒ 15A + 15B = 25A - 25B
⇒ 10A = 40B
⇒ A = 4B
Required % :
= $$\frac{A}{B}$$ × 100
= $$\frac{4B}{B}$$ × 100
= 400%