Question : At what rate of simple interest per annum will a sum of money triple itself in 16 years?

Option 1: 11.5%

Option 2: 11%

Option 3: 12%

Option 4: 12.5%

Question : What is the rate of interest per annum for simple interest at which Rs. 880 amounts to Rs. 913 in $1 \frac{1}{2}$ years?

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

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

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

Option 4: $2 \frac{1}{3}$%

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 : A person borrowed some money at simple interest. After 4 years, he returned $\frac{9}{5}$th of the money to the lender. What was the rate of interest?

Option 1: 25% per annum

Option 2: 10% per annum

Option 3: 15% per annum

Option 4: 20% per annum

Question : In how many years will a sum of Rs. 3000 yield an interest of Rs.1080 at 12% per annum simple interest?

Option 1: $4$ years

Option 2: $3$ years

Option 3: $5$ years

Option 4: $2\frac{1}{2}$ years