Ganesh borrowed a sum at SI. What is the amount returned in 2 years? I. The rate of interest is 4% PA. II. The SI incurred on the sum in 1 year is Rs. 500. III. The borrowed sum is 10 times the amount earned as SI in 2 years.

From I and II: SI in 1 year is Rs. 500 at 4% rate, so principal P = 500/0.04 = Rs. 12,500. SI in 2 years = 500 × 2 = Rs. 1000. Amount returned = P + SI = 12,500 + 1000 = Rs. 13,500. This is sufficient. From II alone: SI = Rs. 500/year, but we need rate or principal to find total amount, so insufficient. From III alone: Borrowed sum = 10 × SI in 2 years, but we don't know the actual SI value, so insufficient. II with either I or III works.