The simple interest on ₹ 8,490 at 5% and 73 days is

1. ₹ 849

2. ₹ 84.90

3. ₹ 8.49

4. none of these

A sum of money, put at simple interest doubles itself in 8 years. The same sum will triple itself in:

1. 16 years

2. 12 years

3. 24 years

4. 18 years

₹ 7,000 earns ₹ 1,400 as interest at 5% per annum. Then the time in this case is:

1. 5 years

2. 2 years

3. 10 years

4. 4 years

Find the interest and the amount on:

₹ 750 in 3 years 4 months at 10% per annum.