A sum of money placed at compound intrest doubles itself in 5 yr. It will amount to eight times itself at the same rate of intrest in
a. 7 yr
b. 10 yr
c. 15 yr
d. 20 yr

• sum of money double itself in 5 year,so in 10 years it will be 4 times and in 15 years it will be 8 times
  so 15 is the answer
• 9 years agoHelpfull: Yes(4) No(0)
• 15 is answer
  ans 100-------200( 5 years)
  200-----------400(10yrs)
  400------------8000(15yrs)
• 9 years agoHelpfull: Yes(0) No(0)
• 15 is answer
• 9 years agoHelpfull: Yes(0) No(0)