Raj borrows ₹ 8,000; out of which ₹ 4,500 at 5% and the remaining at 6%. Find the total interest paid by him in 4 years.

₹ 5,000 is put in a bank at 5% simple interest. The amount at the end of 2 years will be :

1. ₹ 250

2. ₹ 500

3. ₹ 5,500

4. ₹ 4,500

A sum of money earns simple interest equal to 0.5 times the sum in 10 years; the rate of interest per annum is :

1. 20%

2. 10%

3. 5%

4. none of these

A sum of ₹ 600 put at 5% S.I. amounts to ₹ 720 in:

1. 3 years

2. 4 years

3. 5 years

4. 6 years