The difference between the simple interest received from two different sources on ₹1500 for 3 years is ₹13.50. The difference between their rates of interest is :

0.3%

S.I. = \(\frac{P × R × T }{100}\)

⇒ S.I.₂ - S.I.₁ = 13.50, (principal is same)

⇒ \(\frac{P × R_2 × 3 }{100} - \frac{P × R_1 × 3 }{100}\)= 13.50

⇒ \(\frac{1500}{100}\) × 3 (R₂ - R₁) = 13.50

⇒ (R₂ - R₁) = \(\frac{13.50 × 100 }{1500 × 3}\)

⇒ (R₂ - R₁) = 0.3