Question : If INR 2,000 is invested at a simple interest rate of 5% per annum and the interest is added to the principal after 10 years, then in how many years will it amount to INR 4,000 at the same rate of interest?

Option 1: $18 \frac{2}{3}$ years

Option 2: $16 \frac{1}{3}$ years

Option 3: $16 \frac{2}{3}$ years

Option 4: $18 \frac{1}{3}$ years

Question : The simple interest on a sum of money is $\frac {1}{16}$th of the principal and the number of years is equal to the rate per cent per annum. The rate per annum is:

Option 1: $1\frac{1}{2}$%

Option 2: $2\frac{1}{2}$%

Option 3: $3\frac{1}{2}$%

Option 4: $4\frac{1}{2}$%

Question : The simple interest on a certain sum for 3 years at 8% per annum is INR 9120 less than the simple interest on the same sum for 7 years at 8% per annum. Find the sum.

Option 1: INR 28,500

Option 2: INR 28,250

Option 3: INR 28,750

Option 4: INR 28,000

Question : A man invested INR 4,500 at 5% per annum and INR 5,500 at 8% per annum simple interest. Both investments were for 4 years each. The amount received from the lower rate of interest is what percent (rounded off to the nearest integer) of the amount received from the higher rate of interest?

Option 1: 63%

Option 2: 74%

Option 3: 51%

Option 4: 48%

Question : The difference between the simple and compound interest on a certain sum of money at an $8\%$ rate of interest per annum for two years is INR 56. Find the sum.

Option 1: INR 8750

Option 2: INR 7058

Option 3: INR 7805

Option 4: INR 8057