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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
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Quote:
 Originally Posted by skeeter for simple interest ...
Thou meanest compounded annually, right?

July 24th, 2017, 10:04 AM   #5
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Quote:
 Originally Posted by Khyati Thakkar . . . is double n time is 25/4 yr?
What does "double n time" mean?

July 24th, 2017, 10:25 AM   #6
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Quote:
 Originally Posted by skipjack What does "double n time" mean?
Quote:
 What is rate of interest if principal amount is double. n time is 25/4 yr?
Believe English is not his first language. I interpreted a period after the word double ... maybe doubled?

 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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