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Question -

In a bank, principal increases continuouslyat the rate of┬аr% per year. Find the value of┬аr┬аifRs 100 doubles itself in 10 years (log┬нe┬а2 = 0.6931).



Answer -

Let┬аp,┬аt,┬аand┬аr┬аrepresentthe principal, time, and rate of interest respectively.

It is given that the principal increasescontinuously at the rate of┬аr% per year.

Integratingboth sides, we get:

It is given that when┬аt┬а=0,┬аp┬а= 100.

тЗТ 100 =┬аek┬атАж (2)

Now, if┬аt┬а= 10, then┬аp┬а=2 ├Ч 100 = 200.

Therefore,equation (1) becomes:

Hence,the value of┬аr┬аis 6.93%.

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