Adarsh invested ₹12,600 in three parts in such a way that SI on 1st part at 2% per annum for 3 years is equal to SI on 2nd part at 3% per annum for 4 years is equal to SI on 3rd part at 4% per annum for 5 years. Find the SI on each part.

₹420

P₁ x 2% x 3   =   P₂ x 3% x 4 = P₃ x 4% x 5

P₁ x  6  =   P₂ x 12 = P₃ x 20

P₁ : P₂ : P₃ = 10 : 5 : 3

18R(Total) = 12600

⇒ R = 700

S.I. on each part = 420