If a principal is getting doubled after 4 years, then calculate the rate of interest. (Hint : 27. Let P- 100).

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Let the principal P =100
Given it is doubled after 4 years i.e. Time n= years
After 4 years A= 200
A=P+I
A-P=I
200-100=I
After 4 years interest I=
I= Pnr/100 =>100=100x4xr/100
4r= 100=>r=
Rate of intereast r=