Question : The rate at which a sum becomes four times itself in 12 years, at simple interest, will be:

Option 1: 20%

Option 2: 25%

Option 3: 35%

Option 4: 30%

Question : A sum of money doubles itself in 7 years at simple interest. In how much time will it become 5 times itself?

Option 1: 25 years

Option 2: 28 years

Option 3: 23 years

Option 4: 21 years

Question : If the amount obtained by A by investing INR 9,100 for three years at a rate of 10% p.a. on simple interest is equal to the amount obtained by B by investing a certain sum of money for five years at a rate of 8% p.a. on simple interest, then 90% of the sum invested by B (in INR) is:

Option 1: 8,450

Option 2: 7,800

Option 3: 8,540

Option 4: 7,605

Question : In how much time will the simple interest on a certain sum of money be $\frac{6}{5}$th times of the sum at 20% per annum?

Option 1: 7 years

Option 2: 8 years

Option 3: 5 years

Option 4: 6 years

Question : A certain sum of money becomes triple itself in 26 years at simple interest. In how many years it will become five times of itself?

Option 1: 64 years

Option 2: 52 years

Option 3: 56 years

Option 4: 60 years