Question : If a certain sum becomes two times in seven years at Compound Interest, then in how many years will it become eight times?

Option 1: 14 years

Option 2: 21 years

Option 3: 28 years

Option 4: 35 years

Question : A certain sum becomes 7 times in 8 years at Simple Interest, then in how many years will it become 19 times of itself?

Option 1: 15

Option 2: 18

Option 3: 28

Option 4: 24

Question : A sum of money placed at compound interest doubles itself in 5 years. In how many years would it amount to eight times itself at the same rate of interest?

Option 1: 10 years

Option 2: 15 years

Option 3: 7 years

Option 4: 20 years

Question : A certain sum becomes 5 times in 3 years, at Simple Interest, then in how many years it will become 13 times?

Option 1: 6

Option 2: 15

Option 3: 9

Option 4: 12

Question : A sum amount doubles in 8 years by simple interest. Then the rate of simple interest per annum is:

Option 1: 10%

Option 2: 12.5%

Option 3: 15%

Option 4: 20%