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July 24th, 2017, 06:56 AM   #1
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Smile 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.
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July 24th, 2017, 07:14 AM   #2
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for simple interest ...

$2P=P(1+r)^{25/4}$

$r=2^{4/25}-1 \approx 0.117 \implies$ interest rate is about 11.7%
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July 24th, 2017, 07:42 AM   #3
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Thanks@skeeter

Last edited by Khyati Thakkar; July 24th, 2017 at 07:45 AM.
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July 24th, 2017, 09:33 AM   #4
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Quote:
Originally Posted by skeeter View Post
for simple interest ...
Thou meanest compounded annually, right?
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July 24th, 2017, 10:04 AM   #5
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Quote:
Originally Posted by Khyati Thakkar View Post
. . . is double n time is 25/4 yr?
What does "double n time" mean?
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July 24th, 2017, 10:25 AM   #6
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Quote:
Originally Posted by skipjack View Post
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?
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July 24th, 2017, 10:27 AM   #7
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Probably means "double in time"....
which is still obscure anyway!!
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July 24th, 2017, 09:12 PM   #8
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Math Focus: Trigonometry and Logarithm
Or 2 x n.
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