The simple interest on a certain sum for 3 years at 14% p.a. is ₹ 4,200 less than the simple interest on the same sum for 5 years at the same rate. Find the sum.

₹16,000 ₹10,000 ₹15,000 ₹12,000

₹15,000

If Principal= 100% then Total Interest(I) = Rate(R) × Time(T) I1=14% × 3 = 42% I2=14% × 5 = 70% I2 - I1 = 70% - 42% = 28% ATQ, 28% = 4200 1% = 150 100% = 15000 ∴ Principal = Rs.15000