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July 24th, 2017, 06:56 AM  #1 
Newbie Joined: Jul 2017 From: India Posts: 3 Thanks: 0  Interest
What is rate of interest if principal amount is double n time is 25/4 yr?
Last edited by skipjack; July 24th, 2017 at 10:27 AM. 
July 24th, 2017, 07:14 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,701 Thanks: 1359 
for simple interest ... $2P=P(1+r)^{25/4}$ $r=2^{4/25}1 \approx 0.117 \implies$ interest rate is about 11.7% 
July 24th, 2017, 07:42 AM  #3 
Newbie Joined: Jul 2017 From: India Posts: 3 Thanks: 0 
Thanks@skeeter
Last edited by Khyati Thakkar; July 24th, 2017 at 07:45 AM. 
July 24th, 2017, 09:33 AM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 11,675 Thanks: 741  
July 24th, 2017, 10:04 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 18,595 Thanks: 1493  
July 24th, 2017, 10:25 AM  #6 
Math Team Joined: Jul 2011 From: Texas Posts: 2,701 Thanks: 1359  
July 24th, 2017, 10:27 AM  #7 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 11,675 Thanks: 741 
Probably means "double in time".... which is still obscure anyway!! 
July 24th, 2017, 09:12 PM  #8 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 1,767 Thanks: 121 Math Focus: Trigonometry and Logarithm 
Or 2 x n.


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