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70/i=T

D

deepakraomore

Member
Hello,
Somewhere in question paper of, The sum is as.
70 devided by interest rate gives the term in which money gets double.

Can anybody proves it mathematically?
 
You're solving for when (1+i)^t = 2 - the time when the compounding doubles the initial sum.

Solve for t and recall that ln(1+x) ~= x for small x.
 
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