At the end of 2020, the compound interest amounted to ₹ 3850 at 10% C.I. The C.I. on the same sum and at same rate amounted at the end of 2019 was :

1. ₹ 3500

2. ₹ 4235

3. ₹ 3181

4. ₹ 3182

A sum of money, lent out at C.I. amounts to ₹ 4500 in 6 years. If rate of C.I. is 12%, the same money will amount in 7 years to rupees :

1. 540

2. 5040

3. 5400

4. 4725

For two consecutive years, a sum of money lent out at C.I. amounts to ₹ 2400 and ₹ 2760 respectively. The rate of interest is :

1. 5%

2. 15%

3. 18%

4. 10%

A certain sum amounts to ₹ 5292 in two years and ₹ 5556.60 in three years, interest being compounded annually. Find :

(i) the rate of interest

(ii) the original sum.