nishantg29

 Profile Answers by nishantg29 

• Jul 6th, 2008

 

well direct formula first find the rate....
using  (100*(3-1))/3years.... =200/3
now
 years=(100*(9-1))/(200/3)=12

njoy

sureshmachi.s

 Profile Answers by sureshmachi.s 

• Jul 7th, 2009

 

amount with C.I=p(1+r/100)^n

given sum of money compounds thrice in a year so

3p=p(1+r/100)^3    here n=3

(1+r/100)^3=3    (EQU 1)


then in how many years it becomes 9 times

9p=p(1+r/100)^n

3^2=(1+r/100)^n

from EQU 1

3=(1+r/100)

{(1+r/100)^3}^2=(1+r/100)^n

so n=6

shubham ingole

• Feb 20th, 2016

 

B. 8

swadha

• May 2nd, 2016

 

A. 6

Shrinidhi

• Sep 24th, 2019

 

Let the amount be x
For 3 years, amount = 3x
For 6 years, amount = 3*3x =9x
Hence 6 is the answer.