Question : A certain sum amounts to INR 3,640 in 2 years and INR 4,060 in 8 years at simple interest. Find the approximate rate percentage per annum.

Option 1: 4%

Option 2: 2%

Option 3: 1%

Option 4: 3%

Question : The interest earned on INR 21,000 in 3 years at Simple Interest is INR 6,400. What is the rate of interest per annum?

Option 1: $10\frac{5}{63} \%$

Option 2: $10\frac{2}{63} \%$

Option 3: $10\frac{13}{63} \%$

Option 4: $10\frac{10}{63} \%$

Question : A man invests a total sum of INR 10,000 in a company. A part of the sum was invested at 10% simple interest per annum and the remaining part, at 15% simple interest per annum. If the total interest accrued in two years equals INR 2,400, the sum invested at 15% simple interest per annum is:

Option 1: INR 8000

Option 2: INR 4000

Option 3: INR 6000

Option 4: INR 5000

Question : The simple interest on a certain sum at the rate of 12.5% per annum for 6 years is INR 13,500 less than the principal. Find the simple interest.

Option 1: INR 13,500

Option 2: INR 54,000

Option 3: INR 40,000

Option 4: INR 40,500

Question : A sum triple itself in 9 years at simple interest. Find the rate of interest per annum.

Option 1: $38 \frac{2}{9}$%

Option 2: $33 \frac{1}{3}$%

Option 3: $27 \frac{1}{9}$%

Option 4: $22 \frac{2}{9}$%