A sum of money is invested at a rate of 40 percent per annum . Find the minimum number of years after which it will become double if the interest is compounded annually
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rate =40
principle =p
Amount =2p
simple interest =Amount - principle
si =2p-p
si=p
time =T
Time =(si multiplead by 100) upon (principle multiplied by rate )
time =p*100/p*40
Tme =2 year. 6 months
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